I fooled with backlash for hours. Nothing i can explain will give that experience.
I hear you. I only played with it long enough to determine that although it has a comp speed setting, that setting is ignored. Actually I'm not too keen on the whole concept of backlash compensation, so it was never a big deal for me anyway, I just commented on what I found when I played with it.
Frankly, I'm more and more impressed with Mach the more I dig into the macro capability, and I haven't even touched on the brain facility yet. Mach looks to me like a WIP and it doesn't cost $5,000 so in my opinion, it is an impressive piece of work all things considered.
I was not impressed with the single index threading as I could not see how it would ever work and I said so on the forum and quickly found that pointing out Machs shortcomings is not popular around here

However, now there is quite an effort going on to improve threading with many counts per rev, so I was obviously not alone in my assessment. The CV has some issues, the tool comp is a bit bizarre and as we discussed, the backlash comp is out to lunch basically.
In the plus column is that these issues (at least those important to me) are being worked over for the new version of Mach which is very exciting.