I'm still using Edge 500. Not a single issue in last 4 years. If I ever upgrade it will be Bolt but then again Edge 500 does everything I need. It's small and light. Side-by-side, Bolt looks massive.
Edge 510, 520 and 800 series are all half-baked due to release schedule. What is it now? New unit every 18 months? Garmin software engineers dedicate ~ 9 months of development, punt all bugs reported by users, then move on to development of new unit.
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So is the 810 the Gold Standard? Mine works great for years. had a short period where i experienced issues with blue tooth but haven't had those issues in years which i attribute to a firmware update fix. battery life not even close to an issue. of course i'm on dura ace 9000 mechanical and don't have a power meter, cadence sensor or heart rate monitor so perhaps my set-up is not particularly demanding. about all i do is ride, loo at speed, grade and time and twice a month follow a route. the sole issue i had in the past year, was in france doin a race, i followed a route and at the end of the ride as i stopped the ride, the garmin just went bleep and i could not save the ride or see it on the unit, but someone plugged it in to their p.c. and found the fit file. all i lost was the last 1/2 kilometer, the distance from when the route i was following ended and the actual spot from where i attempted to save my ride. ironically the same exact thing happened to another person on the ride, following the exact same route on the exact same day on a different unit.
And rode 115 miles today and still had over 25% battery in reserve.