They are a brilliant car, had two of them and would have another, one was NA, the other a 2.2 turbo with some mods.
Never had any big bills as did most of the work myself but in the 18 months I had them nothing scary happened.
The interiors are pretty boring (brown for the older one, it was actually brown) and seats in most models are pretty flat and useless (like most audi seats etc).
They hold their value very very well, so if you get a good one you can have it for 1-2 years with no real drop in value, compared to just about any other equivalent car they are ‘cheap’ to own. Insurance is needlessly high, they sound ace, but even the quad cam turbo isn’t exactly quick quick as its a weighty car (bit like the 2.7TTv6 you get in older A6 estates, 250bhp, but 250 tonnes as well).
Just wish the H6 diesel monster was out years earlier than it was, as that is probably the best one to have, goes well, drives well, holds value ridiculously well, amazing reliability, (mostlY) good dealers though some parts are a bit slow turning up and sound ace.