I have a 12 (or 13?) inch square and I like it. I have a big cutting mat mounted upstairs in my sewing room for large cutting but this 12" one I can take around the room for small cuts or downstairs if I want to work down there for awhile by the TV. Mine did come apart from the bottom but when I really looked it at, it was simple to plunk back together. Its not for heavy cutting - or instead of having a big mat, but definitely useful!!
Marysewfun