Saw a guy do the rogue last september on one. We met up with him at the tate creek waterslide and we got an opportunity to try it out in the eddy there. It seems like a ton of fun. I'm sure if he can surf he could probably get comfortable up to class iii if he can navigate. It is inflatable but feels rigid.
Hey, if you want me to take a dump in a box and mark it "guaranteed", I will. I got spare time.