For me it'd all depend on how much... I think they're about £600 without the touch controllers? So if someone said to me £350 second hand with the touch controllers, I'd be all over it like a bad rash. I could probably be arm wrangled for an extra £50...
There isn't a huge amount for them right now, but I reckon it's going to explode in the next couple of years. You'll need a pretty good PC though to do it justice!
EDITED: 12 Apr 2017 23:39 by NUKKLEAR