I run NS2R's on my car, not had any issues with them at all, once you've got heat into them they are a good road tyre! I've also run the Syron Street race tyre which were very grippy but I managed to wreck a set while doing a track evening a brands hatch.
I know run slicks for track use and have the NS2R's as back up if it gets wet out there and obviously my day to day driving!