The barrel looks like it will have the same rubberlike stuff as the TK20... which feels and works great. As popular as the old angleheads are, this thing should do fine. And I think the blue looks fine, although the green and gray are the ones I like best. Too bad they didn't give it a higher high (like 180-220 lumens), but the 5 lumen low is a good move.
Running off 1XAA batteries like NiMH etc I just don't see 180-220. Even if they somehow pulled this off the runtime would be kinda bad. I guess maybe some types of AA size batteries could do 180 but think many more people use standard types that can be had in a B&M. Honestly I don't know but think the runtime levels are good compared to L1D/LD10.
LD10.
General Mode: 9 lumens (34hrs) - > 47 lumens (6hrs) -> 94 lumens (2.2hrs) - > SOS
Turbo Mode: 120 lumens (1.5hrs) ->Strobe
MC10.
3 lighting levels, 2 flashing modes
-Lighting mode: 50 lumens (5hrs) -> 5 lumens (65hrs) -> 127 lumens (1.2hrs)
Quark AA.
Moonlight: 0.2 lumens for 10 days (1ma)
Low: 3.5 lumens for 2 days (10ma)
Medium: 18 lumens for 6 hours (50ma)
High: 70 lumens for 1.5 hours (250ma)
Max: 90 lumens for 1.2 hours (350ma)
Strobe: 90 lumens for 2.5 hours
Beacon: 0-90 lumens pulse for 18 hours
Hard to compare 100% as each mode is a few lumens off etc and the Quark under rates or so I have ben told. I have not seen too many lights running on most common 1XAA that offers too much more for a production line. I do agree that a 5 lumen low is nice.