I love my KAAZ. I'm running about 400whp through one and its put up with it for a couple years now; with events often. I really think the key was a thorough break-in + changing the oil there after and then change the fluid every 1500 or so hard miles.
People who complain about the noise must have issues with theirs or don't realize what they've signed up for. It's a 2-way. You're gonna hear the loading and unloading of a sprung drivetrain everytime you send a load back there (giggity; lol).
If you're looking for something to drift with ("competition"), this guy will perform like a champ. If you're a road course guy, then I might get an opinion from someone who's adjusted the engagement pressure. When it grabs, it pulls two tires; trust me....
Garage Entry - YouTube