Gripforce F1 clutch

Well I have my engine out to replace my oil pump. Since it is out I figure I should do a few things to save me some trouble later on. Replaced the rear main oil seal with a teflon seal. I also decided to get a new clutch. Im looking at one from Gripforce. A stage 3 F1 rated at 550HP and 487 ft/lbs torque. It includes an aluminum flywheel. All for 375$. just looking for any input on Gripforce. Anyone ever use or hear about them please let me know. Heres the link to the clutch from ebay.

http://cgi.ebay.com/ebaymotors/F1-R...4QQihZ005QQcategoryZ33730QQrdZ1QQcmdZViewItem

Yea I kind expected that. No slip in it at all. But I figure its a good deal might as well try it out.