Wife's Xmas present 12/05. She said she always wanted one, and she couldn't believe it when it "appeared" in the driveway 2005 Xmas a.m! She drives it everyday. This is "our" 2nd Jaguar; had an '89 XJS coupe (V12) previously - what an improvement since Ford took over. The '03 is wonderful: 4.2 engine is buttery smooth, and not as fragile as former 4.0 of earlier years' V8s. I put the XK-R wheels on it with all-season Michelins, and these work much better in winter than the 19s with Pirrelli summer/snows -- we have a lot of rough roads in Michigan. KNOW your mechanic, even if just warranty stuff. Not all dealers have "Jaguar certified" ones do work (some go out on own).
Looks/styling, performance (for a grand tourer), prestige, and features. Wife's "blue baby" is unique in our area, and she sure has fun with that.
For what one looks for in a vehicle such as this, not much can be done to improve it. "Nitpicking" items: cup holders, convertible boot cover, and visibility to the rear (although not much catches up with her!).