Hmmm. I’ve got an Edge500 from roughly around 2010.
It’s had a microswitch replaced & the rubber button covers have broken through in one place – solved with some electrical tape, but it still ‘works’.
It functions, but the software is cak so stuff like the breadcrumb trail doesn’t actually work, with the map randomly appearing & disappearing.
The battery indicator is permanently set to 100% for some reason & sometimes when you turn it on it says ‘working….’ for ages, other times it doesn’t.
I’ve replaced it with a Wahoo Elemnt Bolt & aside from a few minor niggles, it is bloody great.