I recently purchased a used 6600 from a dealer and love the machine! I also purchased the table that it fits into and that made life much easier for piecing and fmq. This machine does everything that I want and then some (I am still working my way through the decorative stitches). The 7700 has a few more bells and whistles, but way more money. I just finished a king size bargello and fmq the entire thing on my new machine. I just love it!