Almost without exception every snooker player who I talked into trying my "Yankee" round butt cue...liked it after they gave it a legitamate chance. Not just a few minutes!
Both Predator and Meucci have cue-swinging robots. Bob Meucci made his about ten years ago. They've been discussed extensively over at rec.sport.billiard and in the pool mags. The Predator robot has changed a lot since 1998 or so.