my Bailey loved their cotton, my HQ hated it. Unfortunately I'd bought 2 of almost every color for the Bailey, but found someone else with that machine and gave half to them. I'm saving the other half for when I need a specific color for binding and stuff like that. Though I have found the more I use thread like Aurifl or the new stuff Craftsy sells, or isacord, I like the Connecting threads cotton less and less.
I pretty much stick with poly thread for the HQ longarm.