I haven't seen Aurifil in my town, but managed to find some Mono poly thread yesterday & it's not cheap at $14 per reel. Threaded up the Long-arm this arvo and experimented. Had to fool around with the upper tension a while, loosened it 3 turns, and finally the stitching is looking good. Just have cotton in the bobbin to match the quilt backing, and not sure of how fast I can run the machine. Will take it slow at first and try some serious quilting tomorrow
I bought some polyester prefilled bobbins a while ago and I think they're great. Not totally transparent but they seem to last for ages, are terrific for machine embroidery, and I have even done piecing with them.