Very disappointed – BusyCal: Calendar & Tasks Review

I have been using BusyCal for Mac for years and I am a satisfied customer. I recently purchased BusyCal for iOS to see if it could replace Fantastical. So far it works well on my iPad but it is a bust on my iPhone running the latest iOS 11. On the iPhone it cannot add events. Half the time when I press + to add an event, nothing happens. When the new event screen does open, I enter the event info and when I press Done, nothing happens. The app just stalls. Also, you can't open an event to look at. You can select an existing event (obviously creatd in another calendar app) until the cows come home and the app just sits there and does nothing. I have restarted the phone to no avail. Something is seriously wrong here and needs to be fixed. Update Jan 3, 2020. Had been working wel for a while but now BusyCal on iOS and Mac is choking on my exchange calendar. It absolutely refuses to update. So again it is unusable for me. The built-in calendar app is limited but at least it works.
Review by the toxmeister on BusyCal: Calendar & Tasks.