The XS is Kumhos equivalent to the Star Spec and the RS3. They suck in the rain. The SPT's are closer to the V12 Evo and the Neo-Gen, KDW, what have you. If you're stepping away from what i'd call no compromise summers into something that is high performance but will last more than 25k miles- I'd say do the SPT out of that category. Cheapest, and I know a TON of people have run them with no complaints.