Which one did you get ?It's the softest pedal feel of any after market clutch I have driven. Engagement is grabby but not on/off by any means, and with a little seat time it's not a problem daily driving, and sitting in traffic. I posted videos of the noise associated with the metal throw out and the chatter.
The chatter I wouldn't say is any different than any other aftermarket flywheel. If you don't want chatter period, put your car back to stock.
Mine's in, just finished replacing engine + clutch though so I have a few things to tie up on the engine side. Pedal feel is slightly lighter than the spec stage 3+ that came out, I'll update with first driving impressions this weekend!
You can use stock one but I've seen them fail on other twin plate clutches and it wasn't pretty thats why i suggest using the supplied one and put up with the noise for a while
Count me out of the group buy. Can't trust the vendor when they can't bother to respond.