Had a crap day at work yesterday, so I popped into Evans on the way home, and picked one of them up.
Only used it for 6km on the way to work this morning, and it's looking good. It didn't have a great start as it crashed out of the box, and I didn't get it working for a couple of hours, after doing a factory reset via the website (didn't make any difference), and eventually formatting it and reloading it from the website.
On first impressions, the only frailty/criticism I could make is it can't be loaded/programmed without internet access. I don't know if this is the same for the big brands, but in this case I can live with it. To manage it, you have to install a piece of software (BrytonBridge), connect the GPS to your PC, and when it recognises it, it fires up the Bryton Website. Through there, you can create your own routes using Google Maps, or import .GPX files that you've acquired from somewhere else.
After recording a ride, apparently you have to retrieve the GPX file from somewhere in your user profile on the PC. C:\users\username\appdata\local\bryton\etc. I haven't had a chance to check this myself, this is something I saw in the Bryton forums.
So, so far it looks pretty good. I'll be using it on Saturday with an imported GPX file, and if I have the legs, on Sunday, I hope to do a short 50km DIY/GPS perm, mainly to see if I can get the process and procedure right.