Battery and mounting options are decent. High setting brightness is excellent, medium setting is "ok". The strobe is very good.
HERE'S THE PROBLEM ... you seem to only be able to use the high setting for maybe 5-10 minutes at a time, and then it just turns off without warning, and won't turn back on again (in any setting) for like 30 seconds.
It seems fine to use the flash or medium setting indefinitely, but the medium setting is probably about half the brightness. It's still "ok", but not great for dark-road lighting.