Fwiw, I just installed (50 miles ago) a southbend stage 3 daily in my 6mt sportwagen. Revo pendulum insert. The rest of the mounts are stock.
The car is a completely different car. I pulled out the CDV at the same time. The way it drives is so much more direct. Rev matches are seamless. It's phenomenal.
I have almost no chatter at idle BUT, if I blip the gas in neutral I hear it a little bit. And there's definitely what sounds like chatter in low RPMS with light load. If I spool up a bit it goes away. I noticed it a lot driving up my driveway slowly in first below ~1800rpm.
I can't find other discussions about it elsewhere. The general consensus is that it's normal at idle and that's it.