Long creek mills and YLI are here in our area I did a tour of the YLI factory (Actually 3 tours with different groups) anyway YLI is great for lots of stuff I know I said Aurifil but that is what I use for piecing I general use Signature for Long arming and Mettler or Gutterman for my regular sewing I use sulky or Robison-Anton for machine embroidery I use serger thread in my serger - just like tools there is a thread for every purpose and I use each oe to its purpose.....I don't use Coats and Clark because years ago I had a horrible experience with a spool that broke a lot (It was hot pink and I think the dye may have messed up the thread ) but I have never gone back.....