R888's dont wear much on normal road use. In fact Id say you hardly can get the temperature up in them on normal road use even if you try. My car runs about 10000-15000km per year more than 1/3 of that is on road and mostley with R888's. No problem even in the rain, biggest problem id se in a everyday car is the noise, the sound is loud and very disturbing in the long run. Gripwise the R888's are far supperior though.
For longer trips on road I use original wheels with normal road tires, so id say it depends on how you use the car. Best is a dual wheel setup.