I have this same clutch set up in my car along with a light weight flywheel and MT ET street drag radials. I have no complaint. It's been in there for about 4000 miles. There doesn't seem to be a problem with slipping in the least. It is grabby, but fun at the same time. If I did it again I'd spend extra for the dual disk Mcleod.
I can confirm the SPEC stage 3 is stronger than stock Superformance half shafts.