I also own a vette, which we don't drive in the winter months...for that
matter we don't drive it much in the summer either... anyway
   We own a 2002 jag x-type   2.5 engine..... had it about a year and a
half....so far its needed a new radio because the display was missing a line
or two of its display.... its also needed to have the a/c ground wire
tightened as its come loose, and now (just today) we picked it up from
needing a blower motor.
   If you are considering buying one, also consider buying the extended
warantee.  We bought one and have needed it.  Its not the extended warrantee
from jaguar, so ours is not all inclusive, but it does include much of the
vehicle (its one of the better ones).  I was told (by the jag service guy)
that the jag extended warrantee covers pretty much bumper to bumper where
others do not, but that may just have been sales talk out of his mouth....
   Are we happy with it?  Well my wife loves the car... im not that
impressed.. but to me, I don't get impressed that easily with vehicles these
days.  I can't speak for newer years, and I can't say ours is a lemon, but
if we didn't have the warrantee, the car would be history by now....parts
are not cheap for it.

Hope this helps..

Fwed

I own a 2003 X-Type 2.5.  It has about 39,000 miles on it.  So far I
have not had any problems with it.  It has had all of the scheduled
maintenance done.  The only other work I have had done is the brakes.
They got worked on this summer, around 36,000 miles.  I have read the
2002 and earlier models had some problems.  But, I have not
experienced any as of yet.  

Don't do it by any fathom of the imagination.  I have a 2004 x type which
has been a lemon from the beginning.  I have never had so much trouble with
a car and such lousy service by both the dealer and the manufacturer.  I
have gone through 3 front ends with a variety of problems.  I have had to
complain of many sounds, thumps etc.  After many visits to my dealer, we
were told that I broke a front strut through and through.  Can you imagine?
That was after other failures in the front end.  I would never
lease/purchase a Jag again.  I cannot express this any stronger.  Look at
the Japanese and German Brands.

After 14 years in Audi Quattros, we have had an early 2002 3.0 Sport
5-speed X-Type (10/01 delivery) with ~78,000 miles on it since early
2003 (with ~21,000 miles).  We have had *no* major complaints.  It has
never stranded anyone nor has any important system failed.  One of the
things that the Power Survey would probably pick up is the recalcitrant
defroster vent fascias (on top of the dash) that won't stay snapped
down in place.  If this bothers you, don't buy it; they haven't fixed
it yet and the cars *all* have it.  I consider it a very minor thing
that doesn't affect my enjoyment of the car.

Jaguar dealership service *does* border on the obscenely expensive (and
there are damn few alternatives), but you'll find your treatment better
than any Chevy dealer can offer (Ask your wife how she feels about
waiting in a customer lounge approximately as nice as the Waldorf
Astoria's lobby - only the exotic coffees, juice, water, and
fresh-baked cookies are free.), even if you do have a 'Vette.  The
original Jaguar warranty/full service expires at 50K or 4 years.
Several minor issues were fixed under it, but none were anything I
think I'd have ever noticed (One was a shift boot replacement!?). I
found it to be quite complete.

Since then, I have changed the original rear pads (~$350 @ ~60K; the
front ones are *still good*!) and dropped ~$500 on a front ABS sensor &
line problem that was hard to diagnose and was throwing odd 'check
engine' codes.  Other than that, the car has been wonderful.  It is
driven year-round by my wife.  I use a set of Dunlop Winter M3s in
winter and it will do amazing things with the traction control engaged
(you can always turn it off to do *crazy stupid* things if you want -
and I have).  I understand the autoboxes have been more problematic,
but I have no experience with them.  The engine (both 2.5 and 3.0, in
the US) is a lovely V6 with Jaguar-modified heads and intake on the
durable Ford Duratec.  I've seen almost no complaints whatsoever about
it nor about the Gen II Mondeo-based suspension.  Some early models had
a 'screeching' noise from the rear end or driveline.  Ours has not,
unless that brief noise when it was around -20F was it.  I'm not
exactly 'easy' on a car, but this one stands up to everything I've
thrown at it.

My own winter driver is an '01 Grand Cherokee while my summer ride is
an '88 BMW 535is.  Aside from some minor 'ground clearance' and
'passenger leg space' issues, the Jaguar is easily capable of doing
virtually everything either of the others does.  I'd autocross it, but
she won't let me ... =:^(

And ... not that this matters in the least, but I am constantly amazed
by it ... people are unceasingly impressed with the name.  Trust me;
I've been driving BMWs and Audis for decades and no one but the most
diehard car fanatic is any more impressed by them than by the mention
of the name "Jag-you-are".
--
C.R. Krieger
(Been there; done that.)

I have a 2003 3.0 and  have had no problems.  Replace rear brakes that's it.
Runs great

I own a 2003 X with 39k miles and it runs perfect.  I had to replace rear
brakes and regular schedule maintenance.  Very happy with the purchase.