Got to say it depends on the dealer.
We bought the mk5 from Battersea VW which I found to be an unpleasant experience, and personally felt they couldn’t give a toss and was VERY badly messed about with the delivery dates being bounced more times than a 16 year old trying to get into an over 21's night club (even when started to look at cancelling the order as was so fed up with them they didn't care).
However on the upside.... Found that Warrington VW and also one in Birmingham who I can’t remember the name of I found to be excellent.. They always went out of there way at both dealers. We got the mk5 serviced there a few times was very impressed so bought the mk6 there. Big thumbs up regarding customer service from me regarding both sales and service at both dealers.
A funny story was my first experience of BMW dealers who I found were extremely rude, unprofessional, and didn't take anyone who is \ or looked young seriously. I remember when I was 19 and was lucky enough to own a 6 month old 318i Msport (the original 16valve one). I took it to the local dealer in Southport for something. Went in and nobody came over etc. Went to the service desk still nobody bothered to come over even after pressing the bell and waiting. So while waiting had a quick look inside a convertible that was right by the service desk. At that point some bloke came in to the dealership and came over the convertible. At that point a BMW sales guy sprang up to his feet right away, came over.... and said..... "mind out of the way of the gentleman lads!!!!".....
Last year was the first time went back to BMW dealer since that incident, was to look at an M3\335i as replacement for the wifes 3door mk5 GTI as needed a 4 or 5 door due to arrivale of little ones. Was a different dealer and they were ok- as soon as walked in was asked if needed any help and seemed fine - which was unexpected! Sadly for BMW sales stats ended up with the mk6 GTI after very good experience at the warrington VW and also loved the car!