i have one and i did like it very much until the other night.
i have since built the foam table with the vinyl and i went from free motion beginner to free motion advanced overnight.
i really can't say enough about how well this foam setup works and it crazy cheap.
if you have room to make one in the sewing room you might want to give it a try.
here's the youtube clip in case you missed that thread.
http://www.youtube.com/watch?v=yAS25v3ZTk0