I bought BS2 a good few years ago, my first using brew software. Thought it was pretty great though the GUI and workflow was pretty horrible. Bought the mobile app specifically for the timers. I took a break from brewing for the last 2 years, just got back into it a few weeks ago and saw the new 3.x version available. I was pretty excited, hoping for new GUI/workflows, but was disappointed to see it the same.
I don't need the new features and I especially don't like the push for subscription-based (I know standalone is available, but still). Also, as many others have mentioned, the BS3 mobile app crashes at the WORST possible time and also doesn't seem to notify if it isn't in foreground, which makes it pretty pointless.
I'm going to get a trial of Beer Tools Pro and see how that goes, though at this point I'm starting to like the idea of simplifying and using a spreadsheet with known equations. I think I'd rather it be simpler, be "mine", and deal with more possibility of numbers being off than juggle software. Which of course isn't to say they aren't all great additions to homebrewers toolbelts, just happens to be the way I'm headed.