I bought my HQ Fusion without the pro sticher, then upgraded a few years later to add it. My husband wanted to be able to do some quilting and he had no interest in FMQ. He did a few, then lost interest. I probably use the robotics 75% of the time. I do a lot of all over pattern, and quite a bit of special quilting using it (like motifs).
I was so-so about it the upgrade to the Pro Stitcher premium that came out this spring. They finally fixed some of the more difficult issues. I super love the new features with the accelerator (slows down automatically for corners and curves). Now I can do an all over pattern at 100% (full speed) and the machine slows down as needed so I get a much nicer stitch and it's not jerking all over the place. That has significantly shortened the amount of time when I use it.
Until I got that software upgrade, I was seriously thinking of upgrading my whole system. Now I feel like I've got a new machine compared to the problems I had before the upgrade. I wasn't having a lot of problems, just felt like I was having to do "work around" to compensate for some lack of features.