Hi Drew,
I have had a number of problems with it, i can not put the 10lt containers of adblue in as it registers it as overfilled and will only give me 650 miles.
Next time i had a problem i got VW in Hull to reset the vehicle for me which sorted it for the 2nd time.
I have recently had a new adblue injector fitted because a rodent had chewed the wire off and the garage where struggling again to get the adblue tank to register, they emptied the tank and only put a set amount in it.
I have now bought 3.5ltr bags of adblue from Halfords and when out gets to 1500 miles on the dash i only add 1 bag so I don’t overfill it.
If you have the 2017 model apparently overfilling is the issue, you can buy a special nozzle from VW which prevents you from overfilling.