Maintaince goes without saying ...
RR's failed before it's 1st service afaik..
Don't be put off by people that claim dsg mech's being a major issue when deciding whether to purchase or not.
Weigh up the pro's and Cons, and also do take note of what Real life owners say in what they think of dsg or S-tronic boxes.
Use the search function, there was a poll I posted with about failing mechs, which did seem to highlight cars in the 57/08 reg having more issues then others.
But what I can assure you, although QD says otherwise, it's not a Common problem to older cars, and that most had issues in manufactures warranty, less so out of warranty.
There was a dsg owners forum posted a while ago, but had little more then 20 members on as registered, with niggles, but again, not a forum with 100's of complaints.
Again, with any purchase of a car from a dealer or garage, a years warranty is normally given, which would cover you in the possible event of you buying a car with a faulty mech's, that the previous keeper didn't disclose.
in guess I've been lucky, having owned 4 dsg cars with not one single issue, but there is a case of a new owner on another forum, who's had a 2nd mechs fail, but again, under warranty.
Good luck with your search
it's a great car And even better in my opinion with DSG
Edit.....
Website in question...Not busy but have a look
http://www.dsgproblems.co.uk/