Hmmm I'm still a bit confused I see some ppl saying the e01 is brighter and some saying the gui is brighter. Also it seems like ppl are getting e01's that perform differently?
. . .The IU is however modable . . .
I have both and the Gerber is a little dimmer but as others have said has a wider more even beam. The good thing about the Gerber is that you can actually use a AAA (yes AAA) battery in it in a pinch.