I attended a 'directors invitation event' this weekend and asked about corrosion on alloys and wiper arms on the 450h.....not a known problem, I was told.
Worryingly, when I looked at an 09 rx450h on the forecourt, both the wiper arms and the alloys were bubbling. When I go to buy, I will insist on some extra cover for these. 50k is a lot for something that scabs up in 3 years.......now, what did I do with the Q7 brochure..lol