i have a novi 2K on my car and my buddy has a KB on his.
i like his as a fun street car but i still like my centri for traction purposes.
PD blowers are great if you want 500 rwhp but it is hard to get them to hook.
mine will hook 600 hp with no problems
both have their ups and downs. it's really a personal preferance.
i prefer TT!!!