The Janome 1600P is the same machine as the Pfaff GrandQuilter Hobby 1200 and the Viking MegaQuilter. I have the Pfaff version on a Grace frame with the stitch regulator and it works real well. I've quilted a couple of quilts with it and never had a problem with tension, even with invisible thread. The only problem with it is the 9" throat. It's smaller than I now want, so I'm moving up to a Tin Lizzie 18" machine. But overall, it's a very nice machine.