I use serger thread almost all the time, especially if it is a project that I can use my basic white, cream or gray. I've had no problem with it at all and I don't run out as often. It seems to be strong enough for piecing the projects I do. If I were quilting for competition, I might think differently but my quilts are for using or hanging on a wall at home. Whatever you choose is good. Maybe use up some "old" stuff as long as it passes the test of pulling on it between your hands--it works for piecing. (Will be inside and nobody knows.)