I have used T1R and T1S(sport) on numerous cars such as MX5, Senator ,MV6, Westfields, Alpina B10 and the Z3M with no issues. I do find however the T1s better in really wet conditions. They have also served me well on track days on all the above cars.
Some of the above where on T1R as T1S were not made when I had the cars.
On the Z3M the T1S rears lasted just about 4,000 miles and that was being gentle with them