I received an order of thread from Superior yesterday and have done a little testing. It's wonderful thread! Here are some samples using the Perfect Quilter 17wt cotton thread and the King Tut 40wt Egyptian cotton thread.
The yellow swirls on the left are the Perfect Quilter. The other swirls are with King Tut, but using a zig-zag stitch to do the quilting.
A little hard to see, but again, this is the zig zag free motion quilting. All I can say is that I wish I had ordered more colors. Guess I will be sending another order in real soon!
I also ordered some metallics and some of the Bottom Line (a very fine bobbin thread) which I've used before and love.