I didn't plan on owning this product.  I have a Palm Pre and was just fine plugging a male-to-male 3.5mm connector into my phone to listen to podcasts in the car... until the phone got stuck in headset mode one day... well that's another story.  I have an aftermarket Sony Xplod radio that doesn't have Bluetooth, but does have an aux input.  So when I saw this product, I was pretty excited.  I read the reviews and saw the issues other people had with hissing and noisy calls, but figured I'd give it a try for a little over $20.  When it arrived, the instructions are little more than pictures. There isn't anything in the included instructions about pairing the remote with the cigarette lighter portion - I had to find that through this forum and through the Kensington FAQ.  However, it paired with my phone extremely easily, and after pressing the CENTER of the remote it also paired with the cigarette lighter.  The attached cable that is "cut off" in the pictures was just a little too short to reach from my cigarette lighter to the aux input on my stereo, but there was an included extension 3.5mm wire that allowed it to reach, although now I have this coil of extra wire under my dash. Sigh.  So, the moment of truth- play music through the phone.  Yes, it was very quiet and yes, when I had to turn up my stereo to hear the music, there was a loud hiss.  So, I was on the phone to customer service.  They needed a number from INSIDE the remote (not the cigarette lighter portion) to send out the ground loop isolator, but they agreed to send it out free of charge.  A few days later, I noticed that the volume on my phone's music player wasn't turned up... for some reason it reset to a low level when pairing with the Bluetooth?  But when I turned the phone up, I could turn my stereo down, and the hiss all but disappeared.  I will say that the sound is a slight bit "muddier" than the direct connect, it seems like the LiquidAux (or my phone, no way to tell) doesn't output very low frequencies as well, so the bass isn't quite as defined.  Again, that is before I adjusted the car stereo's equalizer to compensate.  I plugged my phone's charger into the charging port on the side of the LiquidAux and that worked fine.