2000 Jaguar XJ8 Reliability

I really want to get a Jaguar XJ8 years 1997-2001. I keep hearing incredibly good reviews or completely terrible reviews of this car's reliability. I know that the problems with these are the timing chains/adjusters and adjusters are plastic but simply upgrading them to the aluminum ones will fix the problem of its engine failing after the timing chain/adjusters break. So my questions to your are; Are these model jaguars reliable? And if I were to buy one from a dealership which has been fully serviced but has 200,000 miles on it, would it last at all?