i've used it 2x. once very unsuccessfully and once it was okay. but in both cases wherever you stop and start, you end up with a tiny pokey end that itches like mad unless you manually leave a long tail and sew every end back through the top and batting. what a pain. i used top-quality ultra fine poly and it took forever to adjust the tension and then to get it back to normal. imo, not worth the trouble.
oh, (BIG OH!) it is IMPOSSIBLE to see it to thread it!