I have to agree here. I also run 255s and have thrown on some new NS-2s. Despite being light years better than the worn Bridgestones I had on there, NS-2s are fine in the dry (havn't been out in wet yet). They seem reasonably progressive. I wouldn't drive on the edge with them but can't go past the fact that 4 of these is around the same price as 1 top shelf tyre. BTW, during my years of Go-Karting the best times I had were sliding around in the wet at a safer speed. I would rather see some learners do their drifting slow in the wet than at mad speeds in the dry and learning the hard way.
Axel