I’ve had one for 8 months.
The device itself is good and robust but the entire package is let down by the woeful web interface you have to use.
I’ve tried to up,ad routes to it but nearly always get any error.
Until Bryton actually improve this, I would still reccomend a Garmin.
As for accuracy, compared to my friends who all use Garmin devices, the Bryton seems to underead on distance and elevation slightly.
On the plus side though, battery life is amazing. 24 hour rides are no problem.