There was a decent article on the Pawnee in one of the UK flying magazines a couple of years ago. I have it at home and will try to remember to look up the issue number so that you can track it down if you wish to do so.
I have never flown a Pawnee, so can't give you any firsthand advice. I have been towed by them a few times, and certainly the climb rate is extremely impressive.
Everyone that I have talked to says that the Pawnee is very easy to fly. I wouldn't imagine that it is all that difficult for gliding clubs to solo tow pilots, assuming of course that the latter are experienced on tailwheel airplanes. After all, most high performance sailplanes are single seaters, and that doesn't usually prove an obstacle for check-outs.
These are the comments of someone I know who has flown the airplane: "The Pawnee... it was my first single seat airplane checkout. I had gotten quite used to having lots of dual before going solo in a new plane. It was a bit intimidating but fun. It IS a great tow plane. It climbs like a beast and descends even faster. The cockpit looks tiny from the outside but it is huge inside - the rudder pedals are so wide apart it feels like a mac truck. I have only ever flown it the once without a glider on tow. The climb angle I remember was ridiculous. Even with a twin grob with two on board it climbs fast."
MLS-12D
P.S. I would be very surprised to learn that the Pawnee is aerobatic.