I've never tried the Xantia so i've no idea how my car is like compared to it.
How does magic carpet feel like?
it's surreal. Imagine all the little road imperfections and smalle potholes disappear. You'll no longer feel the "speed-breaker" stripes on the road. You could just speed through those speed bumps. it's feels like you are riding on water and not physical springs.
But the tradeoff is, and this is especially true in the Xantia, some people will get a bit of "sea sickness".
Sometimes the suspension computer is trying to be funny by increasing and decreasing your car height at traffic lights.
If I have mechanical knowledge, I will get myself a cheapo Xantia, service and repair it myself, just to experience the serenity...
You got a good comfortable car there. I always liked the new C5 better than the Pug 508. I feel that the Pug is trying so hard not to "feel" french, whereas even though the C5 is advertised as a "French German Car", it still feels like a proper French car.