I have only been to the PHOF a handful of times, and every time Tim was very nice and cordial. Pinball Circus went down while I was playing it (ball got stuck) and Tim took the time to come and unstuck the ball, and let me stick my snout inside the game for a few minutes.
Another time he came over and chatted me up for a bit about what games I own, and even remembered to get me a few copies of the TOP DVDs that he was out of a few days before. I never asked him for repair tips or anything of that like.
Overall I have never had any issues with him. Seems like a nice down to earth guy who has done a ton for this hobby, and for a whole bunch of other people while asking very little in return.