This is just genius, I have used it for two or three quilts already, much better than crawling around on the floor, and spraying nasty spray basting, which I did before I read about this.
Here is the top I finished (pieced on my lovely Singer 66 from the 40s). I'll have to introduce you to that machine soon.
And here it is being pinned:
I hope this helps someone, I sure love this technique. I bought some pre-finished mdf boards at a hardware store, they are 6 feet long and work great.