I've been using the Connecting Threads Cotton for FMQ and piecing, and am kind on the fence about it. On the one hand, it is a nice strong thread and I experience very little breakage. On the other hand, I have to completely remove the bobbin assembly and brush out the lint after every 1 or 2 bobbins full of thread, which is kind of a pain. Previously, I used Coats & Clark which wasn't quite as strong, but it wasn't as lint-y. Of the two, I prefer the Connecting threads because I'd rather have stronger thread, but I will probably try a different thread the next time I am running low to see if I can find something better.