I'll be using mine this weekend at the Mayhem big game and it's only a Level 7.
I wouldn't use it in a sup air game, where the weight and inability to shoot a consistent 10.5bps lane would be a disadvantage, but for big games, walk-ons and scenario they're great. Played a couple of games this year with my GoG eNMEy, which offers almost identical performance to a 'mag (although it's a LOT lighter) and had no problems competing with people running top-end electros.
The advantage of running a classic mag is that it gives you an upper-body workout while playing
Can't believe I used to lug one of these around with stock, 20oz and 3.5oz tank all bolted to it!