C&C was the only thread I used for many years but when I bought my Viking about 18 years ago it didn't perform we'll with it. My newer machines prefer Guttermann, Metrosene & Aurifil. I still have quite a lot of the older stock that I use on my FWs but am thinking of getting rid of it. Took a while to convince my daughter that the grade of threads sold by bargain stores is really not a bargain.