Maxi Lock is the best of the serger threads. BUT, still not good enough for piecing a quilt....It is like a 2 ply thread versus the 3 ply that is what a sewing thread is. Hold a piece of serger thread in your hands like you would dental floss. Then pull it apart, between your hands and it will pop very easily. Then try the same with a regular thread. You will be surprised at how quick it pops.
Hope this helps...