I have old thread from my mother that I cannot bear to throw away. Sentimental. I use those to baste my quilts together. I feel a connection to her I guess. I am beginning to appreciate the differences in thread. My Bernina's DO NOT like Sulky at all. I was at MQX and the Sewing Expo last weekend and bought several brands of threads. I found King Tut is delightful to machine quilt with. Never tried Glide, but bought 8 large spools at the show to try. I also bought Superior. I generally piece with Gutterman, but my Bernina dealer just told me to use Aurifil. I am lucky that the Aurifil dealer is in the next town, so I am hoping to pick up when I need some thread as she does not have a storefront. As everyone stated, it's all about personal preference. Just like quality quilt shop fabrics. Some people insist on quilting with cheaper Walmart type fabrics. In the end, you always get what you pay for.