As an Edge 820 user, in retrospect I wouldn't have a problem with an Edge Explore so long as it can pair up to my HR, Cadence and Speed sensors. I don't have a power sensor, and probably never will, so all the FTP and Power functionality of the Edge 820 is lost on me. I do use it for navigation sometimes. And it's great for getting my ride uploaded through my phone to Garmin Connect and Strava.
The features I find most useful are related to speed, distance, % grade, total ascent, elevation, heart rate, max speed, average speed, odometer (per profile; I have one profile per bike), and of course maps and navigation following either routes that it creates or routes I've created in the Connect app or on Strava. I think most of that is available in the Explore.
I do like the ability to see text messages and weather advisories pop up on screen. I think the Explore probably can do that too.