I use an 840, which should have the same (more or less) features / sensors / software, and it’s the best bike computer I’ve used (Bolt v2, Karoo 2, Karoo 3, Edge 830, Roam 3, many watches) for following off-road trails. In my experience it has the best maps, has elevation / topo overlays, and trailforks maps built right in so you even get trail names on the maps in most MTB networks that I’ve tried around me.

As long as you turn off all annoying beepy features – or it will CONSTANTLY be beeping at you flashing that you’re “off course” if you’re riding a trail that branched from or runs parallel to a Strava segment or similar that you happen to have starred months ago, even if you’ve made it very clear you’re not interested in riding it at this particular moment.

That said, I’m still looking to switch to something else because *my* 840, at least seems to be buggy and is just driving me nuts. So YMMV. If your primary use case is mountain biking, I’d personally look at the new Edge MTB or something like the 840 over this – the bigger form factor just seems like more liability than benefit for MTB and both would be cheaper than this, but that’s all personal / tradeoffs.