The sensitive issues that I refer happened when the machine first came out. I did not try the machine myself but am just passing along what I had read (which was on this board). At that time, some people reported the 7700 didn't like going over several thicknesses of fabric. There were a few other recurring problems that several people mentioned but I don't remember what they were. Any time a new machine comes out, there are probably quirks that need to be worked out and new owners always have a learning curve. The best way to determine whether the machine is right for you is to try it out for yourself. The additional 2" throat space would be great!