I bought this Edge as a supplement to my Fenix 5 because I was missing navigation and routing.
The 520 plus fulfils these functions to my complete satisfaction. It starts up quickly.
Route changes are recalculated in a short time (approx. 2 - 5s).
Pro
Simple and intuitive operation
Very large memory for own maps (e.g. OSM)
Remote control button
Contra
Configuration of the profiles not via the web portal