I used to have a 630 which I got for the stitch regulator (BSR) I never did get the embroidery module for it as I had my Viking D1 which I used for embroidery. It was a fine machine for piecing and I did try the BSR and it worked OK. I think a lot of folks used the BSR like training wheels. Once they got the hang of free motion quilting, they found it is smoother to quilt without as which any stitch regulator you are sometimes fighting it as it tries to maintain that even stitch for you. Even on my longarm, I will occasionally turn it off if I am doing smaller tighter motifs as it then goes much smoother. My stitches may not be as even, but the shape of those tiny swirls are smoother. My dealer only offered me $500 on trade in a couple of years ago as it was an older model and no longer being made. It was in good shape with all the accessories that came with it. I actually wish I had kept it for what I got on trade in as it was good for piecing as it had those 5 mm feed dogs.