I use everything that I like and works for me. A lot of coats and clark, and yes, serger thread for FMQ which I like a lot. I can't break it if I try and it looks good on the quilts I use it for. To me they are all linty anyway, so I just keep my machine clean. I have aurifil, wonderfil, glide, YLI on a cone, Isacord, Superior threads, a lot of different brands. They all work in my machine so I use them. I don't use polyester for piecing just because it is more slippery at the ends and I am not good about leaders/enders. None of my quilts have fallen apart, had broken stitches, etc. even the ones the grands have used and have been washed a zillion times. I went to a presentation a while back by a YLI representative and he did a demo with everyone thinking cotton was the strongest, but, it wasn't and he said just use the thread you like if it works in your machine. Seems good to me.