I love to stipple all of my quilts. It comes out really nice and its fairly easy. When you wash your quilt any slight error will never even be noticed.It really, really looks nice and I think its easier and funnier then stitch in the ditch. I also have a horizon and it very easy to do on that machine. Use a supreme slider cover the feeddogs up keep them up. I highly recommend gloves...it will help you keep rounded corners since it will be easier to move your fabric. Good luck, can't wait to see what you do.