I'm still on the fence with the Bolt - what it's capable of, it does very well and with no obvious bugs (assuming the lack of TBT directions for the "look up place in companion app and get directions to there" feature is not a bug), and the phone integration and syncing is fantastic (I have a Google Pixel running Android 7.1), with clear turn by turn directions from Komoots (and you can even create routes on your phone with that and send them to the Bolt whilst out on ride, this can even be done without a network connection, if you pay for offline maps), and presumably from RideWithGPS too (I've still to try this) too, and once you've sent the route to the Bolt, you can turn off the phone (or at least Bluetooth), if desired. The display of the data fields is very clear and the "Perfect Zoom" feature, which lets you easily change how much data is shown on the screen, works very welll.
The main thing that still bugs me a little is that the maps are *very* basic (and small, not surprising considering the unit's size), with no street names displayed, even at max zoom (which only goes as close as 200ft, would be nicer to be able to go closer for tricky turns) and once you zoom out further than 1000 ft are pretty useless in terms of seeing anything helpful, which combined with the lack of being able to pan around the maps really does make the maps *only* really suitable for following existing routes (preferably with Turn by Turn directions - though at least such routes are easy to get onto the device), rather than getting a general sense of orientation and checking what's around you. The lack of colour on the maps also makes differentiating types of roads and tracks difficult.
This is a bit of an issue for me, as the main thing I want a GPS unit on my bike for is navigation - I'm not a competitive cyclist, and don't really need any "training" features (though some basic stats are nice, as is the ease of uploading my rides to Strava and RideWithGPS), but I *do* want to be able to navigate when cycle touring, both for single day 50 mile+ outings, as well as much longer extend touring trips in the UK and abroad. The TBT route display is good, but I think the Bolt is only going to be up to the job if I also regularly check the map on my phone to get a better sense of orientation.
On the other hand, all the current Garmin Edge units with navigation capabilities seem to have major problems (though I have considered getting a secondhand Edge 810), so the alternatives don't seem that great...