Being very much accustomed to Ergo levers before I got a Di2 setup, I seriously thought about remapping the buttons to be more like Campy since early on it was very easy to miss-shift by pressing the wrong buttons. But ultimately decided against it on the grounds that there would still be a learning curve to get comfortable with new shifters anyways, might as well keep things simple and just get used to the default which works perfectly fine. And a few more weeks of riding later I had no more concerns, just took a while to build a new shifting habit.