I have it on my GT spec mk7 in the UK. I bought the car used and it was factory fitted from new. Wasn't sure if I'd ever use it, but as a techy I couldn't wait to try it out after picking my car up.
I have to say, its surprisingly good, I use it for most parallel parks, switch it on as I drive looking for a space, then indicate and drive past it when I find one. As soon as its happy with the space, stick it in reverse and it just does its thing!
I use it for bay parks too sometimes if I'm going to reverse in, its ideal in multistory car parks. I still get a smile on my face sometimes when it asks you to pull forward a bit as it goes back the second time to get you spot on centre between the cars either side in rally tight spaces!
Of course it has it's limitations, you can't use it all the time as the conditions might not be good (i.e. no others cars parked properly around the bay - but at that point there is tons of space anyway). It will fail every now and then (usually if i turn it on too late once I've passed the space a bit already), at which point you could try again, but I usually just take over at that point.
Overall I like it, if I bought a VW brand new I would add it as an option now I've used it. I do have a reverse cam from factory too, so I think that gave me a bit more confidence to use it the first time as I can see behind and observe better as it steers. I know someone with it fitted that never uses it as they find it too much hassle to use... I'd say if you have it, at least give it a few tries after watching a video on youtube that explains how to use, once you know, it really is very simple.