I have a Viking Mega Quilter 18/8 and it does not like Aurafil one bit. It does love Guttermann, and YLI. I only use cotton thread on mine, haven't tried any poly as of yet. But one day I was doing a quilt that needed a neutral thread, which I did not have. I put some of that thread that WalMart carries, on the larger cones, and it liked it. Go figure.