6 months later still not a single complaint, rattle, or issue. Driven on street, and enough track days to get them dialed in. Car is fast for what it is. Had a recent nose to tail full session with a fully prepped boss 302 on conti slicks and couldn't quit smiling after at how balanced the car was. A bit loose, which is perfect for DE fun.
They make these for the 991 GT3, and I'm considering a set for my 991.2 on order, for the same dual purpose use. They just work, but you gotta be willing to adjust them.
If you drive your M3 to the track you really do need to try a set of Trofeo-R's at least once. I'm a Nitto guy through and through, but I'm now on my second set and they are awesome.