I have a 6600. The built-in walking foot has never gotten in my way. My dealer called me a few weeks ago and told me that the Horizon is replacing the 6600 and he would give me what I paid for my 6600 if I wanted to step up to the Horizon. I can't afford that. But my point is that if that's the case you might be able to get a 6600 for a really good price.