I agree that it is a major improvement on DT2. There remain GUI idiosyncrasies. I am relieved to read that I am not the only one who has found DevonTech’s attitude to their customers to be an absolute disgrace. These guys have had, over a decade of use, zero customer service courtesy. I eventually abandoned the app altogether.
My hope is that this has changed too; I had an issue with iCloud syncing which initially received the usual curt and dismissive developer response but they subsequently mellowed.
By comparison with their fellow German developers at Ulysses, however, they have a long way to go.