The stealth spinfusor is brutal. It gives you a free spinfusor shot when you are invisible at an unsuspecting opponenet and you can usually ollow up a second one that's a little harder because at that point your opponenet is on guard.
I am shocked at how much fun the game is and each patch makes it better and better. I was really dubious of the microtransactions but you really can unlock everything by playing. But even the base stuff is fun. Right now it's still beta and they need more maps. They are listening to the community.