Installed a RCD330+ head unit in my Scirocco today and really happy with it.
Worked immediately after connection and with a little coding got it to show ParkPilot (with the Scirocco car graphic) instead of reversing camera (as I don't have one installed) and changed over the steering wheel buttons so the mic button triggered Siri rather than just muting the audio.
Here's a few images from my fitting (gallery with more here,
https://imgur.com/a/BEhDX), don't mind the United Car Care air freshener hanging about!
Original RCD510 ready to come out

Just the quadlock and dual antenna connections in my NZ-new Scirocco, no reverse camera or anything else fancy

Quick test fitting

Obligatory CarPlay proof shot

Finished product with my newly fitted MK6 MFSW buttons in the background, everything matches stock with the exception of the chrome silver trim where the rest of the car is brushed silver

Pretty happy to have gone from the average RCD510 with no bluetooth or phone preparation, to MFSW buttons and full CarPlay in a couple of weeks, and without enormous fitting expenses!
Happy to answer questions about coding if anyone has some. Interestingly after fitting the head unit I got some errors related to the MDI interface in the arm rest which required me to disable it in the gateway's 'Installation List' to resolve, as well as one for the missing reverse camera module.