when I had my straight stitch Juki, I used it on a frame for quilting... it worked great. i love my F600 for sewing. I tried FMQ on it one day and ended up with nests on the back. i'm sure it was operator error. i never tried the FMQ again. If i could have only one, i'd choose the F600 as i'm sure the FMQ could be adjusted to work fine. I've not been any good FMQng on any DSM i'owned, so i won't say that it can't do a good job.