The good news: it is a good light for my type of bike commuting (between house and train station on suburban streets with dim street lamps): bright, easy to use, versatile (choice of all four LEDs on; two on, two blinking; all four blinking).

The bad news: It is very difficult to remove two of the four batteries -- the two oriented with the positive end towards LEDs -- when it comes time to change batteries.  I couldn't do it with fingers alone, and I have very strong hands and nails.  Fortunately, it uses batteries in a miserly way, but when you need to swap them out, it will require a pointy tool of some sort.  This is a serious design flaw.

Sadly, there is no piece of ribbon to go under the batteries and help get them out.  So, when I put the new batteries in, I put enough scotch tape around the two "difficult" batteries to leave a "tail" I can use to tug them out next time.  I'd advise others to do the same.

Be warned.

Also, I agree with a previous reviewer that the mounting is so-so: it required a two pieces of rubber to go between the handlebar and the mounting clamp to get a grip sufficient to hold the light steady when hitting even modest bumps.  This is more of a quibble compared to the battery issue, though

ADDITIONAL NOTE AS OF OCT. 2008 -- for whatever reason, the light will no longer flash.  Clearly something has happened to the switch.  Bottom line -- between the battery replacement issue and this issue, it is probably best to look at a different light
The good news: it is a good light for my type of bike commuting (between house and train station on suburban streets with dim street lamps): bright, easy to use, versatile (choice of all four LEDs on; two on, two blinking; all four blinking). The bad news: It is very difficult to remove two of the four batteries -- the two oriented with the positive end towards LEDs -- when it comes time to change batteries. I couldn't do it with fingers alone, and I have very strong hands and nails. Fortunately, it uses batteries in a miserly way, but when you need to swap them out, it will require a pointy tool of some sort. This is a serious design flaw. Sadly, there is no piece of ribbon to go under the batteries and help get them out. So, when I put the new batteries in, I put enough scotch tape around the two "difficult" batteries to leave a "tail" I can use to tug them out next time. I'd advise others to do the same. Be warned. Also, I agree with a previous reviewer that the mounting is so-so: it required a two pieces of rubber to go between the handlebar and the mounting clamp to get a grip sufficient to hold the light steady when hitting even modest bumps. This is more of a quibble compared to the battery issue, though

ADDITIONAL NOTE AS OF OCT. 2008 -- for whatever reason, the light will no longer flash. Clearly something has happened to the switch. Bottom line -- between the battery replacement issue and this issue, it is probably best to look at a different light