do you have any major brand cordless tool batteries? ie, milwaukee m18, dewalt xrp, etc. it would be tough for me to justify yet another battery format to need chargers and spare batteries for if i was already invested in one of the lineups..
that said, my milwaukee m18 LED worklight (forget the model # offhand) has lasted a couple months of use so far with two significant falls, and soldiered through a trans change in the pouring rain at the track; still chugging. not exactly a long term test yet, but we're getting there.
that said, its more of a 'spot' light than a flood and positioning it to light exactly where you want can be annoying - i've had to bungy it to wheels/axles/subframes to get what i needed lit in the beam.
ahm