One day I run out of that gray thread and thought I have no idea what to get. I look at the store and they have different thread weights. colors, etc and I was lost. Steph works at a quilt store and introduced me to Aurifil thread. She tells me she likes it because it is so thin it doesn't add too much to your piecing, making it easier to get accurate results. This gets my mind working. I really need to learn about thread so I started buying quite a few different brands.
I can't say I have worked with a bad thread. I have tried Mettler 50 weight, this was my very first thread. I didn't have any problems with thread, it did seem a bit thicker than some other brands. Then I got Aurifil, probably my favorite even though I really don't have a good reason why. I do feel that I get less fuzz build up in my machine, not sure if that is actually true. I tried Coats and Clark, which many say is really bad and I didn't notice any problems. It is Coats Cotton so I'm not sure if that is why or maybe I'm just not a picky thread person. I have also tried Gutterman and Masterpiece by Superior threads. Both of those are great.
I turn to Superior's website the most often for thread education. While I may not do things too much different than I did before my thread education I now am much more confident when I go to the thread aisle. I am curious what thread everyone else is using? I'm sure I still have tons to learn.