Well, I also drive a XJR, and after you get use to the fact that the gray haired guy looking back at you in the mirror is you, it is great. Yes, when we first got it, I felt only old gray haired guys drove these cars, then I saw one in there mirror

Got to tell you, 390HP, in comfort, with a few friends is pretty fun, eating 5.0 stangs, while wearing a coat & tie, is just priceless.
I ran into the long time parts manager of Brumos Porsche a few weeks back, while driving the Jag (my 911 was at Brumos having some work done) and I admitted to him, this car is fun, and fast, and that I may stop doing PCA stuff (and have, our region sucks!!!) and give the Jag club a try (I met a pretty hot brunette who is active in the Jag club) and now will

Back in college, a girl I dated use to date a guy who bought an old RR (and no, he wasn't older than her or me) and she thought it freaked her out, thought he was weird, and she drove an MG Midget

As everyone has said, unless you want her to take everything, don't buy an RR