I have a Pfaff Grand Quilter I bought used from a lady in our Guild. I absolutely HATED trying to quilt with my regular piecing machine. The Pfaff never comes off the frame because it weights too much. But, if I had it to do over again, I would look for a 13-15 inch throat. You lose space to quilt very quickly, usually half way through a lap quilt. Wouldn't give it up for the world (until I get a larger one).