I stopped buying thread for the ridiculous prices of some name brand ones. Most have so many spokespeople who have lots of influence over quilters to push the use of them. and of course get all their thread free. It is good thread but they aren't getting my money. I use poly thread for piecing and quilting. I buy Maya 120 from Wawak online and Sew Complete from Superior. Also Essential Pro from Connecting Threads has more award winning quilters using it then you realize. I have talked to too many non thread spokespersons who won awards at big quilt shows and they all use poly thread. All machines are testes at factory using poly thread and the tension is set on them for poly thread. Poly will not harm cotton fabric over time. If I use cotton thread I use CT Essential or Missouri Star cotton thread. I use Glide prewound bobbins from the money I save not buying over priced thread.