Originally Posted by raptureready
I've got one and LOVE it! It's especially helpful when making larger blocks like the ones I used for my GGDs's quilts. I'm even searching for a bigger one.
I think a bigger square would be a bit unwieldy. I love the 20" but sometimes it's a pain.
When I'm working with larger blocks or squaring quilts, I use the Salem 24" folding ruler.
http://www.checkerdist.com/products/notions/?v=S060
(I KNOW I didn't pay that much...it was under $30 so look around. I just wanted to provide a picture).
The great thing about it is that it doesn't take up space at all, and is very portable.