I have in my stash, Sew Fine, Bottom Line, , Aurifil, Omni, Wonderfill, Masterpiece, Glide, Pima, Quilters Select, Isocord, Sew Sassy, Sew Complete, Essential Pro, Mara 120, Gutterman, YLI, and probably a few other brands. Like I said I choose the thead I use for quilting by color. There are a few brands I want to try but with my stash that has built up over the years I only buy thread when on a great sale. 50 wt Aurifil 2 ply uses a different needle size than 50 wt Superior Pima 2 ply with my machine, a Juki TL . I keep a chart of each needle size/type that I have used with no problem with what thread. I need to use all my thread and then, if ever used it all, only buy one brand.