I just wanted to point out that CT's polyester thread is $6 for 3300 yards. Isacord is $5.25 for 1000 meters (about 1100 yards). So the CT is about half the cost of the Isacord. The Isacord is 40wt whereas CT is 70wt, so the Isacord will show up more and the CT will blend more. The Isacord will probably appear more shiney in a quilt because it is a thicker thread.