Janie: I have a Brother 1500, it has the first thread cutter that I ever owned. Every once in a while the needle will come unthreaded when the cutter is used, but not often. The convenience of having the threads cut out weighs the minor irritation of rethreading the needle, but a nest underneath would be a problem. This, like so many things in quilting, is really a personal preferance. One problem is the habit of hitting the cut button when you are FM. Can't tell you how many times I have to unsew so the threads are long enough to tie and bury.