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@ad441
Switched to a Hammerhead recently and just used it for a week's touring in Scotland. After that I'm pretty enthusiastic about it. The map detail is great - hugely superior to wahoo, which for the kind off offroad navigation I was doing was really useful. Elevation profiles seems really accurate too. Battery life is OK, dynamo hub charger kept it running pretty much indefinitely. Lasted fine for regular rides before touring. For a 200k audax I'd definitely take a back up battery. Not that keen on the slowness of drop down menus, etc. Feels slow compared to phones or other gps devices. Routing app stuff/ability to paste in urls and organise collections of routes also really good.
Overall I think it's pretty good. But then I got an ebay bargain one. Not perfect, but think v3 will probably be great and v2 worth it with a discount.