I have used the MaxiLock serger thread numerous times on my FMQ and I like it. It is 100% cotton and fairly reasonably priced. I haven't had any problems with it even after wash and ironing the quilt. But would be open to other users comments. Someone told me that it is a little lighter weight than other threads because it is meant to be used in combination with other strands of serger thread on the serger, but so far no problems, and it doesn't list a weight on the cones.