My first Bernina 640 was a floor model and we got a screaming deal for it. It came with the BSR (which was why I wanted it but never use), the walking foot and the embroidery unit for $5,000. Well, the thread started getting stuck under a guide it shouldn't be going under twice. I don't know the technical term for it, but it made a horrible clunking noise and then the thread would break. Very frustrating. It went to the shop four times with no improvement. Finally, I went to pick it up and the shop owner told me they had just replaced the machine with one right out of the box. She couldn't fix it, so I got a brand new one for the same screaming deal. I haven't had a single problem with the replacement machine and I have had it for three years.