I’ve used just about all the top lights out there, Six Pack and Maxx-D (current 2016 models), various Moon offerings, Gloworm X1/X2/XS and numerous overhyped Chinese offerings. Never have I come across a light that works so well for MTBing, doing so much with relatively modest lumen figures as the Liberators!
I’ve got 2. Ones battery has died, the other I need a bar mount for, but they’re ace! I tend to use a Maxx-D most of the time for the convenience of being able to swap between various bikes including road, and the self contained nature. But if it’s out and out trail riding performance you want, get a Liberator, get the LED’s and optics updated to the most modern specs, get a new battery for it, and you’ll be laughing!