I so agree with Paper Princess:I was doing FMQ on my domestic machine and was doing sort of OK, but when I tried the long arm at the shop I was in heaven."
I too have quilted on my sewing machine. But it is hard and does takes some strength to move the larger quilts around. The longarm is a much easier way to quilt and if it is possible to find one to take classes on and rent it is so worth your time.