I have a BSR on my 440 also. It gave me confidence to start FMQ, but I outgrew it in a few months. It is just too limiting. Also, the reason to get a quilting machine isn't the stitch regulation but the ease of quilt manipulation. I can do quilts so much easier on my S16 than I ever could using the small throat of the 440. I didn't get a stitch regulator on my S16 either. My quilting is not perfect, but practice makes it plenty good enough.
PS: anyone want to buy a 440 BSR?
Pam