I think the NS Stick is more suited to someone coming from a guitar only world, but one think I like about the stick is that it is different, it forces you to do different things.
I have the advantage of starting life on the piano, but spending most of the time since teens on a guitar. Its still in the 'little too different' group, but I was just randomly playing it yesterday, without any concious thought of trying anything, and it was starting to make some noises that weren't too unmusical!