Interesting discussion, didn't have much luck with my thrift store shopping this weekend but I did look at a set of Madeira embroidery thread. Lovely collection of what looked like full spools, but I don't do embroidery.
I'd like to try glide thread for my bobbins, but I can only find pre-wound bobbins and my machine has a proprietary bobbin that isn't L, M, or 15. I bought some So Fine to try, have a couple of preemie quilts to quilt down and figured it would be a good test.
So in using these threads for quilting, you think they would be fine for bobbins? Is that for both piecing and quilting, or just quilting? I do press with a very hot iron while I'm piecing. They are also very shiny. I guess the only way to check out how I like them on cotton is to try them. After all, $6 for 20 or so spools is a lot less than what I paid for my cone of So Fine.