I got her back form the dealer yesterday for the Diff issues and since we didn't have a car on our development ramp I pulled her in to have my first look underneath.
What I did notice was both rear lower ball joint for the stabilizer bar link are torn.
Has any body else noticed this it seems odd for a 25,000 mile, 4 year old car.

2011 XK Conv-both front and rear ball joint silicone covers are torn and open-Jaguar dealer said normal for a Florida car? Would like to see if covered under warranty.

Interesting this was a Florida car!
Judging by how they've dealt with things so far I'm pretty sure they will cover it. They've covered things broken interior trim, peeling insulation on the firewall, break pads.

I've noticed this with my car as well. I believe its just poor quality rubber bushings and ball-joints.
Does anyone know of polyurethane bushings that can be purchased? Seems every bushing on my car is fatigued at 22k miles.

Unfortunately this is a very common problem with every Jag I have ever owned and yes it is cover under warranty if enough of the grease has leaked out to cause excessive play.

As far as urethane bushings, they should be avoided as they make for a very stiff street ride and over time develop excessive play due to wear.

Disappointing really no excuse for rubber boots failing after 25k either poorly spec'd material or poor bushing / boot design requiring too much travel for the design.

Ditto... and my perspective is that its actually a small price to pay for the ride quality enjoyed... Anyone who has ever been a passenger or a driver of any one of my Jaguars has always commented Very favourably on the ride and handling quality.

I'm actually not over impressed by the ride quality of my XKR. Although normally well composed its easily unsettled by surface variation at speed while cornering. During cornering the rear suspension seems soft but over small bumps it bounces.

I find the ride to be firm and responsive to my driving. My previous fun car (1977) was firm to harsh but I believe it was due to old technology along with old parts. I guess ride is subjective so it all depends on what you are looking for. I recall years back when I was looking for a family sedan I test drove a XF and XJ which I found to both be a little firm but comfortable. At that time I was looking for a more comfortable ride for taking trips so I continued to look at different cars. I ended up buying a Lexus which to us was like driving on my couch. It was soft but handled OK and met our needs. After getting the XKR we took it on one of our yearly jaunts (4 1/2 hr ride) and found it to be fairly comfortable. My days of track driving or even spirited driving I find this car good on all the roads I have traveled.

Well, as Jagtoes suggests, this is subjective. I've driven my share of higher end GTs... And I still don't mind the7 hour road trips every now and again.... In my opinion, the XJR I had was the most comfortable and beat handling car I ever had... And I've been looking for a suitable replacement for 3 years and still haven't found it. So poor me, lol.

For sure ride quality and handling can be subjective. I just drove it this morning through pretty heavy snow. Once I turned off the TRAC completely she handled it pretty well. I just put her away and I'm driving the jeep we've got 6" or more since lunch time