I've got one and it works well. The output isn't impressive, but that helps it achieve a 45+ minute run time. It's a great choice if light weight is more important than output. If you'd prefer a less tightly focused light pattern, the Arisaka body can me paired with an M300 head. This will have he same beam profile as the Malkoff M61, which many (including me) consider to be outstanding, especially for indoor use.
I've also got an M600 with an E2 Super Throw. It significantly outperforms its smaller sibling, but run time is quite short.
My next one is going to be an M600 with the E2T. I won't be surprised if I end up preferring this one over the others.
They all have decent tints, if that matters to you. Their fully potted design means that you don't need to worry about recoil damaging them.