What are M7RR's like on track?
Very good from my experience. I was running with them last year and will be again this year. As a compromise I rate them very highly. On a dry warm trackday the supercorsas are a bit better but unless you are chasing times they're a lot of fun to use and keep working if it gets wet. The only downside is that they get a bit loose when they get very hot under heavy use, but they can manage 20 minute sessions just fine on decent pace.