I have a pair of pipe NAS and they are fun skis. Insanely durable, more lightweight than my atomic punx. I did have to detune them as the magnetraction was a bit too hooky. I dunno how they would be on rails. They have incredible pop and are at least twice as stiff as my K2 recoils, I don't have any other skis that are nearly so stiff. This makes them really fun on jumps, pop plus their lightweight. The bases are beasts that can take abuse like nothing else, Lib-tech uses a 9k weight sintered base which is twice the density of most companies. My biggest complaint is that the shovels were low so they deflected easy in chop. The stiffness/full camber plus magnetraction means that they will try and ski you if you let them, you really have to stay on top of them, but they will reward you in flight as they love to fly.
Ultimately I prefer a softer ski, but if someone had the confidence and skill I think they could really make the pipe nas work for them well.