Oh, I love this thread about thread. I own two Berninas. One is an 830 Record from the 70s. Used to use C & C all the time. When I purchased my used Artista E it came with 300 spools of Isacord. It loves Isacord. Isacord on my 830 Record actually bounces out of it track of threading on the upper thread... go figure! On a few of my vintage machines C & C (manufactured this century) throws the tension off and makes a mess of things. My motto or habit, if you will, is if a brand gives me problems repeatedly on a machine... I don't use it, I move it to another machine. Quilters and threads are funny. We are all different and we just have to find what suits us. I have heard alot of Aurifll but since I have lots of Isacord, it will be a long, long time before I switch over.