I have used everything from coats and Clark's, gutterman,connecting threads,mettler, sulky,superior and haven't had any problems with any. I use gutterman the most because of the sales at joanns

Such a loaded question :D, only because there is such a vast number of answers. With my computerized Bernina that I bought off craigslist came about 200 cones of Isacord. So, for the most part I use it. I have recently learned to appreciate Bottomline in my bobbin. Doghousemom probably summed it up best... buy cautiously and experiment before you start laying out lots of $$$ Also, if someone else's quilting has the 'look' I like, I ask them what they used.

I piece with whatever thread I can find that works (doesn't show through) for the colors of fabric I am piecing - trying to use up older poly threads from making clothes. But when it comes time to quilt, it's only 100% cotton as my 6600 doesn't like anything else for FMQ. I buy my cotton thread from Connecting Threads. I love the wide variety of colors and even better when it is on sale! It is a bit linty, but a more frequent cleaning of the bobbin case takes care of that.

thanks everyone! i figured these would be the answers id get but no harm in asking right? thanks a lot! looks like i have reading to look into!