I have one, but it is in an un-airconditioned building right now waiting for fall. Having it set up with my second sewing machine keeps me in business inside the house with my main machine.
It isn't as easy as the video shows to get good results. You have only about 4 to 6 inches depth to work on if you have a regular sewing machine. Also, you will need a wide space to set it up, 4 feet on either side of your sewing machine. I found the big red PVC rollers to be cumbersome. I set two dining tables end-to-end with a lower end table in between to put my machine on so I would have a flat area to move my quilt top.
He says you can get longer poles to make a wider quilt top, but I don't think I would be able to manage that much weight.
It does keep the quilt nice and flat. I think I might use it to sew quilt sandwiches together, but I don't know if I'll ever be skilled enough to do much free-motion quilting on it. I plan on practicing more when the weather cools down.