I have used it in my longarm and it works just fine. If you use their fabric, the thread is a perfect color match. It's linty so clean the bobbin area often. You need to also match it to your quilting pattern. It's a bit thicker, so I prefer to use it with a quilting pattern that doesn't have a lot of places that you travel back (i.e. stitch back over the same stitch line) because I don't like the look of the thread build up. Also, 1,200 yards doesn't go as far as you would think in a long arm. If you are planning on doing a king, get 2 spools!