No VAC issues here as of 1:20PM EST. I've got 175 hours logged using the aforementioned author's software.
However, after the .51 stable push, multiple features of the software aren't working properly. The ESP only shows a small fraction of the players, leaving the rest unmarked. When players do show on the ESP, they typically show as "corpses". The item ESP only shows a fraction of the loot too. Also the magnet feature doesn't work, but this may be due to the method being detected.
With all that said, his DayZ Standalone software is the best I (a script purchasing noob) have ever used. No windowed mode, aero issues, or constant bugging the author for updated files. His software is more polished and professional than Dayz itself.
I assume some of his fixes may take longer than others as he (according to him) doesn't copy paste code from around the internet.
I just wish we knew what was going on with these VAC claims and buggy software. Getting him to respond to me on Skype has been unsuccessful since purchasing the software. However, I've only had general questions and not major issues.
I'll post immediately if I run into any VAC or global ban issues.