I played Henry about 2 years ago just to try to learn something. We were betting cheap, I think 10 or 20 a game. I wanted to play him even, since we were betting so low. He insisted on giving me some weight since we were on bucket tables at the time, and they were not one pocket tables according to him. One of the games lasted a good hour, without either one of us giving up a shot. Of course he beat me (I'm a C+), but just hanging with him for that one game was one of my finest one-pocket moments.
He has the best cue ball and moving knowledge of any player I have seen in person. I was watching him play a guy once, and he made a shot almost exactly like the one Steve Cook made on one of the accustats tapes against Hopkins (I think) where he removed 5 balls in one shot on the end rail and completely ruined Allen's position. Henry made a very similar shot in the stack area against a local player. He must have studied it for a good 5 minutes, seeing exactly where every ball was going to go. When he finally shot it, the cue ball froze against a ball, and 5 balls were removed from his opponents side. Probably the best shot I have ever seen. There were a few local top flight open level players watching, and they remarked he moves like a ghost after that shot.