• That really worries me :( I've never ridden more than 200k with it, and now I fear my 810 will behave that bad too...

    I've asked my local long distance community for their experience, some used the 810 on the 2013 MGM (http://www.strava.com/activities/76987571) and got problems on the final km... their advice is to break the route file you're following into 3 or 4 files, and also start with the device clean of training records. Maybe you tried to follow a big route file the times you got the freezing problems?

    The fastest rider of the PBP apparently had no problems with the Edge 1000: https://www.strava.com/activities/372806960

    I can't find any info or experiences using a Bryton or TwoNav for long distances...

    Maybe the solution is to downgrade to a unit without maps and the TBT functionality that seems to be the main problem (Edge 500 / 520) and just load a route with handmade waypoints for each complicated turn (that will also serve to study the course). I've used an Edge 305 for almost 7 years without an issue (apart from battery degradation), but sometimes a tight 'Y' type intersection was hard to take without error while going fast or offroad

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