Hi Dan,
Welcome, I've had a 2.0d sport estate (from new) and now a 2.5 V6 SE auto, from my point of view they are great cars. I'm pretty fussy about maintenance and detailing and so far (touching wood) been super reliable, the sport had 200k on the clock when I sold her. They go through the typical bits and bobs through their life as you would expect with any car, I had many years of German company cars and have not found the X to be any less reliable, infact, the styling and comfort is far better in the Jag (my opinion) Look after them well and they should look after you.
Happy motoring
A