I have been using 40 tex Signature- Cotton thread and it's been ok. I haven't been 100% satisfied with it. A fellow quilter told me to try 30 tex and I would like it better. Then another quilter referred me to Signature Threads! I decided to give it a try. I ordered one spool just to try it out. It arrived the very next day! I'm impressed. Then I put it on my machine, I had to adjust the tension a tiny bit but it's awesome. I am using the King Tut brand and this stuff is like Gold! It's way more expensive than the signature brand but I can tell why. Hooray for good thread!!