I bought the Aftermath M4 knight cqb. I am currently in the process of replacing the hop up on it - its brutal, there might as well have been no hop up on this thing.
Hopefully once its done it shoots better...which I think it will, but thats an extra 50 bucks I had to drop on it.
I have the Kraken and love it, works dreamy, has a very slight wobble but for 99 bucks, you cant go wrong really. Shoots fast far and straight.