I’ve got an edge 800 and mounts for it on all my bikes.
Depends on my mood and the purpose of th ride as to whether I’ll use it though.
On group rides it’s little more than a watch to see when we should be aproaching the cake stop, and if we’re 30min from the ends drink up any remaining water, eat food etc otherwise it’s going to waste.
On my own it’s usefull as a map.
Round a trail center its usefull to see an average speed to encourage more effort to beet the previous.
But I did start just putting it in a back pocket or using my phone just to log the miles into strava for the yearly total, especialy if its been a while between rides and matching the last average is impossible.