Touch wood I've never had a problem with Citroen hydropneumatics, but obviously some people do, especially with aging cars. The original C5 model was the first where Citroen dispensed with all the complicated pipework running up and down the whole length of the car. Hopefully that should improve the reliability considerably and fleet managers/private owners won't be quite so concerned about potential failure as time goes on.
You will have noticed how the old BX, XM, Xantia models sink to the floor when left unused for a few hours? Doesn't happen with any C5 if you notice.
That was a result of doing away with the suspension fluid being pumped all around the car, with the consequent saving of all that pipework and its potential for corrosion and leaks. The work is now done by electric motors instead. The battery now keeps the car level at all times, even when the engine is switched off.
As you climb aboard, you can hear the faint hum of these motors priming the fluid at each corner and the car levelling up to accommodate the weight change.
In a nostalgic sense, I actually miss the car pumping itself up on the turn of the key nowadays! Sad eh?

The Germans these days have a few reliability issues of their own to address, particularly VW and Mercedes!
They have managed to build up this perception of ultra-reliability (unwarranted in my opinion) and I suppose you can't blame Citroen for trying to tap into that, sad as it is to watch.
I still believe Citroen build good cars in their own right and I've never been disappointed in one yet. For the price, they have represented good VFM.
You are absolutely right about the superior ride quality though. The moment Citroen starts to emulate the harsh riding German wagons, they'll be losing me as a customer. And I think the rot has set in -- some new C5 models are only available without the hydropneumatic suspension now.
"a suspension as rigid and aggressive as anything build east of Alsace-Lorraine".
What a ridiculous statement by the maker of the finest suspension in the world.
Talk about shoot yourself in the foot.
貌似是关于C5底盘升降稳定性的争论？  估计也是这个原因，来中国减配了

藏龙卧虎的爱卡  才冒出一个高手来翻译啊。 谢谢啊。 大体意思懂了。说实在的，翻的不是很专业。 嘿嘿