Yes the Xantia is still going well. (not sure if you have read my blog recently)
I have had a few trials and tribulations with it in the last year though, including a failed wire in the under radiator wiring harness (that killed the engine and central locking completely and took me a week of after work tinkering to find and apply a work around) a leaking heater matrix (fixed with Forte, fortunately!) and most recently a sticking thermostat causing overheating when it would stick closed, which turns out to be a 6+ hour job to replace on the V6. Almost a year after getting 4 brand new Michelin's I'm still yet to find someone that can balance the centerless rims so I'm having to put up with some significant imbalance at motorway speeds

(Will have another go soon trying to find somewhere - fortunately I don't drive at those speeds often)
Other than that it has been a good car, unfortunately while I have been able to keep up with the maintenance I haven't been able to keep up with the bodywork and interior as much as I would like, due to a combination of money and time (a 10 month old takes a lot of my time!) and crappy weather, so that I never seem to have a fine weekend align with one when I have time on my hands.. It's pretty filthy at the moment and needs a proper spring cleaning inside and a jolly good clean on the outside. I don't think I'll ever get a chance to repair the original dents and scrapes that the car came with...
Because I now have to drive for some of my daily commute to drop of my son with his gran each day I'm racking up the miles too and I'm worried that I'm running a classic car into the ground on the daily grind. Odometer Mileage has gone up from 65k when I bought it to 82k now in under 3 years, so it can't really be considered to be a low mileage car now!
As I've talked about in other threads I'm seriously considering buying a little electric C-Zero or similar for the daily grind both to lower my running costs, (drastically!) but also give the old girl a rest so I can keep her in a bit more fettled shape and prolong her remaining years, so she can be a weekend car instead of a commuter and daily dogsbody... That will all depend on whether I can make the numbers work with a C-Zero...