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It'd be nice if there were more ways of getting TBT tracks onto it
You should be able to do it on the app and transfer to device.
Thuekr-
Only if you're telling it a place you want to go and then it auto-generates the route for you in the app. Which is potentially useful, but not what you want on a long audax where generally you're following a GPX track.
Currently the options seem to be a ridewithgps track with cuesheet entries, or using something called Komoot which will allow you to upload a GPX but then edits it to preset bike friendly routes they have. Then you can edit it some more yourself. It's a slightly convoluted process though worked pretty well when I tried it out around Kent (it actually took me onto some nice roads I didn't know).
This is just for turn by turn navigation. If you just want to follow a route on the map page it works fine with just a basic gpx track that you can get onto it in tons of ways (e.g. email it to your phone). The map page also gives you 4 data fields so for most purposes you could leave it on that. It's clearer to follow than Garmin maps page. TBT flashing up was useful on night bits as with just a map route you wouldn't be alerted to turns until you missed them. If that makes sense.
(am a bit tired still)
ad441
Did first long distance test of Elemnt Bolt at weekend and seems huge improvement over Garmin - recorded whole of Bryan Chapman audax as one track without issues. TBT navigation worked fine -the occasional roundabout instruction seemed slightly confused, but just switched it to map view for those. Didn't fear it crashing when switching between pages or anything. Charged reliably via Igaro D1. The auto upload to Strava at the end went funny and came out at 100km, but did it via the phone app instead and came out absolutely fine. It'd be nice if there were more ways of getting TBT tracks onto it (I used ones from someone else's ridewithgps which worked fine, but I do miss Garmin's ability to generate them automatically). I worry slightly that the rubber charging port cover looks a bit flimsy and could eventually break if charging it on the go too much.
But basically I'd recommend it. The ability to control stuff from phone and load up new routes, etc is great - if you're away from home with no computer you can still do everything.