After the luxury of a touchscreen on the Edge 1000 - what a pain to have to configure the 520 with various profiles.
Here's the smart solution.
Buy an Edge 1000. Configure all of your activity profiles on the 1000.
Connect to your computer.
Go to the Sports folder of your Garmin directory. Copy all of the activity profiles which you have just made.
Connect your 520.
Go the the Sports folder in the 520 Garmin directory.
Paste
Job done.
Put Edge 1000 in drawer until you feel you want to do another activity profile using the quick surefire method.
Bonus ... PLUS - if your 1000 is configured for a Varia, your 520 data screens will display a little radar symbol in the top right-hand corner