Very small, screw in nature makes it easy to use with existing co2 setups. Metal tank only requires hydrostatic testing ever 5 years. Minor dings won't damage the tank like with fiber wrapped bottles. The regulator is plenty fast. I don't have any shootdown even when cranking out 8+ bps. High end electro's might have problems, but I wouldn't know.
Heavy as hell. My Paintball Mania Nitro Duck 110ci Micro Reg system (carbon fiber wrapped bottle) weighs LESS than my Crossfire Stub when both are full! Preset regulators arne't my favorite, but they work.
I won this tank at a scenario game and it has become my primary nitrogen system because it's super tiny and gives me enough shots. Expect about 650-700 shots with an Automag and a decent barrel. LP 'cockers will get around 700-800. Definitely worth the money, especially if it's your first nitrogen system.