Works perfectly fine without issues
Sure, it may be a little awkward trying to figure out how to used it but once you get it you have an “ohhhhh duhhhh” moment. Don’t let other peoples incompetence fool you into believing it’s a bad app. Because it’s not. I’ve used it on 5D mark iv, R6 and R6 mark ii. No issues on any of those. At all. Ever. The app does what it’s advertised to do and more, if you want to pay the extra premium. Get it, no regrets.