Machinelady "Why would the speed of the longarm affect the maxi lock. The serger has a much higher speed or at least mine does, There is no way I could quilt at the speed that the serger runs."
I agree that the speed of a serger is much faster than the longarm but you are combining three, four, and sometimes five threads for a seam with the serger and that makes a very strong seam as opposed to only two threads on the longarm. As with everything it boils down to personal choice and that is why a question like this will get as many different opinions as there are quilters. Personally I would not use serger thread for quilting.