Its pretty cool, very nice for just casually questing and whatnot cause you can kinda lean back and chill. I prefer the K & M for dungeons and PVP though, just much more control over everything.
The idea of using a controller is appealing. Playing from my couch and my 50" Plasma HDTV, but i'd probably never do it. Not enough control. I'd do it for a single player game but never multi-player.
Is it just me or does anyone else get the inactive return to character screen while using a controller? This may have been fixed since the recent patch we just had I am not sure but I don't play with the keyboard and mouse so I don't know if the auto kick to character screen is just me using a controller or if it happens to everyone because the server is always maxed out. In any case once the annoying return to character screen that appears every few minutes after a few hours of play stops happening I think playing with the controller will be even more fun. Xbox360 controller is the best in my opinion for this.