The good thing: they communicate 'somehow' with each other
The bad things:
o it's unreliable. I uploaded an ov2-file to the site above... then it was really visible on my Android... but 5 minutes later it disappeared from Android
o GPX-routes seem to be treated as tracks on Android
o you cannot really edit the routes (on the web) in any way that is logical or makes sense
o the sync seems only to work from the internet down to Android... if you delete an imported ov2-file via 'my places' on Android it does not disappear in the web.
o for me this 'my drive' feature is useless as it is implemented now
As to Favorite handling I will continue to stick to the file based ov2-method described here: [Only registered and activated users can see links. ]