I've had my 6600 for 3 years now. Have totally loved it. Walking foot is awesome! While I've had my issues with the machine, it has always been operator error, unfortunately. The feet are a bit awkward to change but you get used to it. Love the auto threader and thread cutter. It's a real workhorse. I don't think you'll be disappointed with it. I bought the best available when I got mine because I wanted to be able to "grow" with my machine and not need to replace it in a couple years. I got exactly what I wanted.