I like the look of this stuff. Tracing paper on a roll, which stays flat when unrolled (which has to be a plus if it is true), and is strong enough to sew together to check the pattern works.
My bet is that it isn’t strong enough to allow you to unpick the stitching, so you would have to trace it again to use on your fabric.
But if you want to test the pattern, this would be a lot easier and cheaper than using any form of fabric for that first stage.
I will be giving it a try at some point. When I have a moment…