Re: I'm reminded of the old C6
The latest C5's are based on the C6 chassis/floorplan. I have had one for two years and when parked next to the "old" C5 I owned, it is about 35cm longer.
And yes, they both have pneumatic suspension as they should.
As for falling apart, I have had absolutely no troubles apart from a split window washer reservoir in the old C5 and I have had 5 Citroens since my first which was an AMI 8 back in the day (four-pot horizontally opposed engine (just like a Porsche)). THAT'S A JOKE.
R