Here's my review of the DX light that Doug mentions above:

http://www.bikeforums.net/showthread...illight-review

If I were buying a small portable light to be my only taillight, I'd get the Radbot anyway, I'm not going to screw around and try to save a few bucks on my main light. But I have a Magicshine rear light, these are just for backup and additional visibility, so I am OK with using these instead. FWIW I think the same of the Superflash - it's OK if you're just riding on low speed streets in good weather, but not good enough for bad weather or high speed roads.