** UPDATED **
After experimenting further I found I liked these better then initially thought.  The weak bass I had decried earlier has been partially rectified, but I do still have some issues (which others seem to share as well).  However, I wanted to update my rating so it more accurately reflected the new circumstances.

I still feel the cable is really thin, lending a rather cheap feel.  And it's too short as well (should be at least 6" longer).  The 3.5 plug seems a bit sensitive to placement, almost as though it was not made to the standard depth.  Several times now I thought the right side died, only to find out that I had to wiggle the plug around to get a tighter fit.  The cable also makes a lot of noise when moved.  I bought a pair of Ultimate Ear MetroFi 200's -- similar in price, size and specs -- and found the cable to be much quieter (but also too short, at around 47").

In order to differentiate the left and right sides there's a microscopic 'L' on the left bud, but to be honest it's so small and inconspicuous that it might as well be invisible.  I've also detected what sounds to be some type of interference or static noise when the cable is moved around, almost as though there's a short or something.  It's a different sound from the cable "rustling" I alluded to earlier.

I broke them in following the instructions as closely as possible.  I used a mid-level volume for about 12-14 hours, then a higher volume for a similar amount of time.  Only then did I actually evaluate them, but I found myself a little underwhelmed by the bass. I ran them at higher volume for another 8-10 hours and listened again, but still wasn't terribly impressed.

Since a number of people have also complained about the weak bass I wasn't completely shocked that the bottom end wasn't terribly strong after the break-in period.  When I posted my original comments someone from JBuds left a reply for me.  While it was quite obviously a canned response -- not directly associated to my comments -- I was pleasantly surprised that someone from there company was actually monitoring forums and answering posts.  Since there reply was so generic in nature I would have summarily dismissed it under normal circumstances.  However, I opted to perform some additional testing because they seemed to care enough about there reputation to at least post a response, something not attempted by the vast majority of companies today.

The biggest change made was to one area I thought I had covered; the gel pads.  When the earphones arrived they had the medium size pad installed.  Those seemed to fit well, and I didn't notice any movement or looseness, so I assumed that was the correct size and didn't experiment with any of the others.  Turns out I was wrong... when I replaced the medium with the large pad I found they actually fit my ear better.  And, much to my surprise, the bass response improved.  Rather noticeably. AAMOF, they now have more bass then the UE MetroFi 200's I bought (even with swapping the ear gels I think the UE's have weak bass).  The take-away here is that proper gel fit is *CRITICAL* to the bottom end intensity, and is something that shouldn't be overlooked.  It's certainly far more imperative then I anticipated.

The JBuds still have a bit of a treble bias, which makes the mid's and high's absolutely spectacular.  The amount of detail, and the crisp manner in which those frequency ranges are delivered, is pretty remarkable.  If your musical tastes are heavy in the mid to upper range you'll be pleasantly surprised at how the J3's make that come to life.  I heard nuances for the first time in songs that I'm very familiar with that just aren't evident from speakers.  Now that I get more bass I would say the sound is pretty well balanced, with the only deficiency being the bass could be a touch more prominent.  But it's really quite minor now.

In the interest of full disclosure I have to admit that mine are going back to JBud because of some issues.  The housing on the right side makes a clicking sound when inserted into the ear, almost as though there's some type of physical contact between two pieces that really shouldn't be hitting.  And the 3.5mm plug doesn't to fit in all the sockets I've tried it in (MP3 player, laptop, "boom box").  Sometimes you have to pull it out of the socket just a hair in order to get the right side to play.  That might be an engineering flaw more then an individual manufacturing problem with my set, because the inference is that the plug is just too long.  We'll see how JBud handles that situation.

Bottom line: for the $30 I paid it's hard to beat them.  They're certainly not worth the quoted $80 retail price (although, on JBud's webpage they're listed with a price of $30, so getting them for what's essentially the true list price certainly doesn't qualify as a bargain).  If you like music that has a lot of it's emphasis in the mid to upper range I think you'll love these headphones, but for rap, hip-hop and the like I'd look elsewhere. My tastes range from heavy metal, to hard rock, to "classic" rock, and for that type of music I think the J3's to a very good job, so I'm pleased with them.
** UPDATED **
After experimenting further I found I liked these better then initially thought. The weak bass I had decried earlier has been partially rectified, but I do still have some issues (which others seem to share as well). However, I wanted to update my rating so it more accurately reflected the new circumstances. I still feel the cable is really thin, lending a rather cheap feel. And it's too short as well (should be at least 6" longer). The 3. 5 plug seems a bit sensitive to placement, almost as though it was not made to the standard depth. Several times now I thought the right side died, only to find out that I had to wiggle the plug around to get a tighter fit. The cable also makes a lot of noise when moved. I bought a pair of Ultimate Ear MetroFi 200's -- similar in price, size and specs -- and found the cable to be much quieter (but also too short, at around 47"). In order to differentiate the left and right sides there's a microscopic 'L' on the left bud, but to be honest it's so small and inconspicuous that it might as well be invisible. I've also detected what sounds to be some type of interference or static noise when the cable is moved around, almost as though there's a short or something. It's a different sound from the cable "rustling" I alluded to earlier. I broke them in following the instructions as closely as possible. I used a mid-level volume for about 12-14 hours, then a higher volume for a similar amount of time. Only then did I actually evaluate them, but I found myself a little underwhelmed by the bass. I ran them at higher volume for another 8-10 hours and listened again, but still wasn't terribly impressed. Since a number of people have also complained about the weak bass I wasn't completely shocked that the bottom end wasn't terribly strong after the break-in period. When I posted my original comments someone from JBuds left a reply for me. While it was quite obviously a canned response -- not directly associated to my comments -- I was pleasantly surprised that someone from there company was actually monitoring forums and answering posts. Since there reply was so generic in nature I would have summarily dismissed it under normal circumstances. However, I opted to perform some additional testing because they seemed to care enough about there reputation to at least post a response, something not attempted by the vast majority of companies today. The biggest change made was to one area I thought I had covered; the gel pads. When the earphones arrived they had the medium size pad installed. Those seemed to fit well, and I didn't notice any movement or looseness, so I assumed that was the correct size and didn't experiment with any of the others. Turns out I was wrong... when I replaced the medium with the large pad I found they actually fit my ear better. And, much to my surprise, the bass response improved. Rather noticeably. AAMOF, they now have more bass then the UE MetroFi 200's I bought (even with swapping the ear gels I think the UE's have weak bass). The take-away here is that proper gel fit is *CRITICAL* to the bottom end intensity, and is something that shouldn't be overlooked. It's certainly far more imperative then I anticipated. The JBuds still have a bit of a treble bias, which makes the mid's and high's absolutely spectacular. The amount of detail, and the crisp manner in which those frequency ranges are delivered, is pretty remarkable. If your musical tastes are heavy in the mid to upper range you'll be pleasantly surprised at how the J3's make that come to life. I heard nuances for the first time in songs that I'm very familiar with that just aren't evident from speakers. Now that I get more bass I would say the sound is pretty well balanced, with the only deficiency being the bass could be a touch more prominent. But it's really quite minor now. In the interest of full disclosure I have to admit that mine are going back to JBud because of some issues. The housing on the right side makes a clicking sound when inserted into the ear, almost as though there's some type of physical contact between two pieces that really shouldn't be hitting. And the 3. 5mm plug doesn't to fit in all the sockets I've tried it in (MP3 player, laptop, "boom box"). Sometimes you have to pull it out of the socket just a hair in order to get the right side to play. That might be an engineering flaw more then an individual manufacturing problem with my set, because the inference is that the plug is just too long. We'll see how JBud handles that situation. Bottom line: for the $30 I paid it's hard to beat them. They're certainly not worth the quoted $80 retail price (although, on JBud's webpage they're listed with a price of $30, so getting them for what's essentially the true list price certainly doesn't qualify as a bargain). If you like music that has a lot of it's emphasis in the mid to upper range I think you'll love these headphones, but for rap, hip-hop and the like I'd look elsewhere. My tastes range from heavy metal, to hard rock, to "classic" rock, and for that type of music I think the J3's to a very good job, so I'm pleased with them.