Compared to the old 3804 build I used for years, this build doesn't respond crisply to the user interface any more. There's a noticeable delay when you jog, stop or start. When you jog multiple times it doesn't respond as nicely as it used to do. I don't know what's changed, but I very much preferred it as it was.
I'm seriously considering moving away from Mach4, I really don't like the way the fundamental behaviour changes significantly from one build to the next, with bugs being introduced along the way. When something works well, why not just leave well alone?
So far, all I've seen from the new build are backward steps from what I had before.