They're an ideal way to get a launch monitor session (free) and to compare different head/shaft combinations on same. Problem is, there aren't any very close to me (usually a 100-150 mile drive) and they can be stressful. Stressful in that the demo staff and store staff like to assume that everyone who demos equipment will purchase $1000 worth or so; also that the lines can get pretty long. I did a Cleveland demo last year, and a lot of their demo equipment wasn't in A-1 shape--especially the grips, which in some cases were so slick you couldn't hang onto the club. I guess of the available options, I'd rather go to a Golfsmith or Golf Galaxy and demo their off-the-rack equipment. There's the same rather pointed focus on your buying something (at least, that's what I sense), but everyday crowds aren't as large.