I've bought NS2R's for my track car, not run them yet though.
I cant see the point of a tyre like an R888 or even the NS2R on a daily. I simply cant see why you'd need that much grip on the road in the dry. An Eagle F1 or similar high performance tyre will easily take you waay beyond safe and sensible on a dry road, and will be much more stable in the wet.
Furthermore, the slicks are expensive, so why wear them away driving to work... Surely much better to just buy another set of rims, fit the tyres to those and use them for track only, and keep normal road tyres on for daily duties. Otherwise you'll just **** your money away in a few thousand miles of boring road driving.
I suspect looking at the tread, the NS2R will be better at shifting water than the R888 if your going down that route.