I agree with Maia about the thread wearing well and if the old thread was so bad why are the old quilts still in one piece for the most part and not just a jumble of little pieces waiting to be sewed back together! I am trying to use up some of my mothers threaded since shee passed away 16 years ago. I mostly used it for wall hangings as they will not get the hard wear and tear of a quilt or clothing. So far my machine has not protested.