Nice little light those, mate has one on his MTB, I use to use a TK21, then 2x TK21... then lattely 1x TK35, but it's a bit of an odd shape to get on with, but good spill and throw.
Yikes @ the Olight SR91... BEAST.
Think I'll try out a Nitecore for my next light. Don't think it will be the TM26 though, too many pennies for me.