Have used it – also use it all the time for the purpose it's sold for, protecting floors. The lays flat part – well,sorta, after a while. The real issue is you gotta buy a whole roll, which is like 60 bucks. I just had some left from a job so I used it. What it's great for is as a pattern for synthetic insulation. Tt's tough to get a paper pattern to lay down on Climashield so that you can mark it. With Ramboard (which is basically fairly thick cardboard), the stuff is stiff enough so that you can lay it on there and run a sharpie around it (but don't do that on a nice floor!), or just cut carefully right up against the pattern. You just have to know somebody in the construction business so you can get scraps.