I'd heard from ladies at 2 different LQS's that they are wonderful but the price was more than I wanted to pay.
Sooooo, showed my handy husband and he made me one from wood and table liner material from Hancock's. It was a fraction of the cost and made to the size I want. It works great and was also told they are great for ironing embroidery on cause it doesn't smash the design down.
I haven't used it a lot because I've promised myself to FMQ several quilt tops before I start any new projects. I have 1 top done and about 4 to go so it will be a bit before I go back to piecing and using my new toy.