I agree with Pure Imaginary on the grenades (in fact, I think I have to find a map where the grenade launcher is less useful), I always like a shotgun, so I am not objective there.
We had quite some fun with the " Space BattleGround" (non-pro version) both against bots and more on a LAN (but we tend to like space maps, so again not really objective).
The battle suit is indeed at least half-useful ;)
However, my major problem is that I just read in the txt file of the pro version that it includes textures from "the Team Arena mission pack".
Is this legal?