Eric Leiswrote a review of Blackburn Flea Front/ Flea Rear USB Combo Light on September 29, 2010
I have good and bad feels about these.
They are small and fairly easy to install. They are sufficiently bright for commuting around the town. Apparently they are small enough that they haven't been stolen off my bike when I've left them on all day.
I don't get the charging process. Once I have charged them they flash bright for quite awhile (about 2 seconds off .1 second on) after being off the charger.
The front light blink speed is seizure speed. I don't really find it useful.
Ultimately I would probably buy these again though because they are handy to have and have worked great so far.