The Janome 6600 has the dual feed dogs. It's called something else. I just bought one on Friday. I played with it for a few hours. I think I'm going to love it. It has a couple of nice features I was not expecting. One the pressure foot raises to it's hightest postion at about 3/4". No kidding. Also it has separate bobbin winder, meaning you can sew and wind the bobbin without unthreading the machine. On the bottem of the foot control it has some kind of surface that keeps the foot from sliding all over the wood floor. It also has some pretty and different decorative stitches. You can sew with cone threads without using the extra thread holder at the back. No, I am not trying to sell one, just what I found out bc I bought one.