Re:
Strange thing I have found with Nobby Nic's is that they either really suit the bike, or they really don't.
I have a pair that I have moved from bike to bike and not got on well with them at all, until I put them on a 1994 DeKerf Mountain, which they suited perfectly and which I had a lot of confidence in. When I moved the wheels and tyres onto another rigid bike, a Dave Lloyd Cats Wiskas, I was back to the nasty slippy things that broke away unpredictably.
Glad they suit your bike and the conditions, they certainly look good.