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Now that you made up your mind:
-90% of the riding I do is structured training with intervals. I use the buttons on the shifters to lap my intervals, especially useful at shorter sprints. I have a Canyon integrated handlebar with outfront mount, and the lap button is in a very awkward spot
-I use a Garmin 520+. I hate the navigation on it. But, if Im navigating a course, that means im mostly riding in a group of 4-6 people, and I like that I can toggle between data and map without letting the bar go. Of course I know how to ride a bike, but its a nice to have.
-Battery level displayed on your head unit.
@onyerbike No personal experience, but when in doubt, Bettershifting: https://bettershifting.com/run-di2-e-tube-project-on-your-mac-using-virtual-box/
You need EWWU111
https://www.amazon.co.uk/dp/B01L06V9XE/
If you want to try it, mine's gone straight back into the box. I was considering sending it back actually as I don't think I'll use it.