I have used all brand of thread. I am using Aurifil now because I found a clearance sale online several years ago and bought the huge cones of it in different weights. The dealer added several cones for free of odd colors. I don't think I'll ever use up one of the 17,000 mm cones! Or ever have to buy thread again. I even have 80 wt Aurifil which is the best bobbin thread I have ever used. I buy Connecting Thread thread kits for the colors and for gifts. If you find a clearance out sale on a good name brand thread buy all you can afford! It will only get higher in price.