I bought a Disco (new) second hand recently. I've been paddling for quite a while now, but this is my first play style kayak. It's pretty easy to carve, and really good on the waves. It's not bad in the holes, but I'm a bit of a novice - I can't cartwheel yet or really do any tricks. Side surfing and spins are pretty good though! Going down rapids is pretty good, the flat bottom of the kayak helps you feel very stable. It's pretty easy to make it go where you want, and punches through small/medium holes pretty well. I think it's a good beginner's playboat.
The only issue I have is that the outfitting leaves a lot to be desired. The back band in my disco doesn't offer that much support (it keeps falling down too low on my back). Another thing is that I've had to replace 4 of the snowboard straps, and I've just snapped another this weekend. However, I don't think this is the fault of riot, but the previous owner using it in either saltwater or chlorine pool (or both) and not rinsing it out. I think this has caused the plastic of the outfitting to go brittle. I did email Riot to try and get some replacement parts but could never get a response. However, it wasn't too hard to take the broken straps to a snowboard place to get replacements though. Trying to pull the seat out to replace them was a bit harder, but you get pretty good at it after the 4th time
If the outfitting looks in good condition, and it's a good price, then I'd say snap it up! a great first playboat!