I've even used it in my emb machine without any issues. When ever I have a problem with a thread I either put it behind the machine in a cup or change my needle to a different size and type if needed but I get it to work. I spent way too much money on a top of the line machine to have it be finiky with what thread I want to feed it. That was one thing that I liked about my new serger, it likes all threads, even with different weights. I could of bought a car with what I spent on just those two machines so I'd better be the one in charge, not them. They are also both self adjusting when it comes to the tension too, even though they are both a different brand. I do have to agree with the ones saying sticking to cotton for piecing, I agree, cotton thread goes with cotton fabric, doesn't cut thru the fibers after a while. If its something that I already know won't be around for the long haul, anything is game as long as I get the look I want