I get what's on sale. Right now I am working through a large batch of Connecting Threads cotton which is a bit linty but I still like it. Then I will work through my large stash of Polyester cones. Can't remember the brand.
My take is: If the machine likes it and you like the look and feel, then use what you have. If the price was right on your threads, why return them?
The ONLY thread my machine refuses is Coats and Clark Dual Duty.