I'm think I might buy one. I watched the video by Marjorie on post #10 and I'm gonna give it a try. Also my grandkids can use it when they start the game. Like any equipment there are pros/cons to it. Even a ball machine has it's drawbacks. There's no substitute for actual hitting which for me is a luxury as I don't always have access to partners. This is also a great way to work out at home. I do believe if you focus on the stroke technique correctly the repetition has to help.
Wilson PSC6.1, but lookin for a Tweener.