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One advantage of the 1030 over the 1000 is that I don't have to think about battery life on rides under, say, 300km which makes the bulk of my riding doable without needed extended battery stuff hanging off the bike. Thinking about it, if the missus is going to do longer stuff this year, Karoo might not be the best option. I'd love to see Garmin move to USB-C and speed up their units though.
Battery life is the only downer with the Karoo. I use 9-10% per hour with the screen on full, so 12hrs is probably absolute maximum with the screen dimmed a bit. Having said that it charges pretty quick with USB C so a quick charge from a battery pack during a cafe stop on my very, very occassional longer rides is not the end of the world.