I know it's crazy but there's that voice in my head that says it can't be good if it's so inexpensive. :P
But I bought a tester spool awhile back and have been more than happy with it. I've been using Mettler thread mostly and price is the only difference I notice between it and Connecting Threads. I bought a cone of Masterpiece and HATE it. I've been using it for my bobbin when piecing but I'll be glad when it's gone.