I have chinese flashlights too, 18650 powered so brighter and heavier. They go in a bike-specific flashlight holder from dealextreme, the one that looks like a microphone holder (just search for it, they have a few). It's ok, I guess?
The flashlights are pretty great for the money but I am posting mainly to mention that mine certainly haven't been 100 percent reliable. I don't know how good your PB front light is but I would place their reliability significantly lower than a superflash rear light. So it's good that you have two!
Because of the reliabilty issue my flashlights do not get used as primary lights on brevets; i only use them for riding in town, as backups for the generator system, and for extra light when descending w. a generator light.