I've never used a sheet. However, the caution against it seems to be hard to hand-quilt (which I don't do) and then the thing about the threads getting cut and weakened from the needle passing through. Now, I have sheets that are decades old.... and the hems, etc. are sewn by machine obviously. The only place those sheets have ever torn are in the middle... nowhere near the machine stitching.... So, maybe I will try a sheet in the future.....