:twothumbs I would "buy both" F1 and F2 it the LED's were upgraded from last time.
the F2 I have Is my Best drop in period. I EDC mine always, and the few times I have lost It I have been Gutted...(Happily found it again though)
In fact I would probably get 3-4!!
I have an F2...but that can run on 1 cell....dont know if thats bad or not...but Its usually two cells!!
I will have to go back over this thread and see what the F1 does again.