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Mine's been pretty good and just reliably navigated round 700km or so of offroad in Scotland.
But it's definitely slower than Bolt v1 & the map lags a bit, which can be annoying if you're trying to navigate fast. Maybe runs about 20metres behind where you actually are (at a total guess). Am guessing this is probably hardware related as they've not fixed this in any of the updates. But that aside it's been pretty good and the colour screen is nice. Coloured coded elevation profile is useful (though sometimes dispiriting).
After switching off the device and closing the phone app, phone still
tries to reconnect to the device via Bluetooth. Have to restart phone
to stop this happening in the background (there is probably another
work around for this).You need to select 'exit' from the reconnecting bit to stop it doing that. It's not that obvious. Agree about phone pairing sometimes being unreliable, though one of the updates seemed to improve that for me.
I don't think so - the Roam came out in 2019, I think, so still relatively new.
My Bolt V2 works fantastically - I didn't have the issue that people like DC Rainmaker talked about at launch (but I live in Derby so not a huge city), and have had no issues at all since I bought it nearly a year ago.