“The 840 replaces my failing 510. Very happy with the 840. Battery life is good (which I was worried about coming from a B/W screen). Easy to read on the bike (except in shadow, but I could turn the brightness up I guess). Compatible with my SRAM AXS (which the 510 was not). More stats and directions with Climb8 Pro, which I'm still getting my head around, but shows potential. Good navigation, and my instigate me leaving Ride With GPS (which is a shame, as the developers are really good and active)”
“Battery life is excellent, I've got mine to about 10hrs now with full brightness of the screen - that's enough for me. The vvariety of screens available is excellent and I've taken a few weeks to tweak the screens how I want - GPLama's YT videos were most helpful there. I'm reducing by one star because I wish I bought the 1040 or 1050 (although I would never have paid that price!) because some more screen real-estate would be helpful with my fading eyesight - that's a me thing so possibly unfair on the 840. I reckon its the sweet spot of price and capabilities, and the integrration with Garmin Connect is outstanding. Cheers Sean”
