ive had nankanh NS2 several times, with mixed results.
In the dry they are pretty good, solid progressive grip. But in the wet, they are only good up to the limit of their grip, then it gets a little bit wild.
For the price, i cant fault them. But for the same price, i slightly prefer the accelera alpha tyres. Slightly better wet weather performance, and on my 530D they were generally excellent (in staggered sport 17" sizes)