We've had our since we bought it new in 2005. It's an '06 Limited. We've got over 110k on it now. Runs beautifully. Timing belt was done by myself and fellow LOST member about a month ago. Not rocket science, but technical.
I took this truck over from my wife about three years or so ago - and every mod I've done to it - has made it 1,000% more fun to drive. Basically speaking, get the GDE Eco Tune asap. (Green Diesel Engineering). It's about $500, and worth way more than that. Changes how the truck behaves considerably. Second, was the Frankenlift II lift kit (2.5 inch +). That was an elective choice mostly, but the sagging CRD suspension needed to be changed anyway. That was a HUGE improvement in the overall handling of the vehicle. Huge.
There's quite a few other bits, mods, and pieces that you can feel free to tinker as you move along of course. I'd also check to make sure you have the updated fuel filter housing. It's not a expensive unit - but will save you frustration later on.
I've done nearly all the work myself, or with friendly help (I'm no expert) - and I haven't needed any special tools etc except for during the timing belt change (cam lock pins, etc, borrowed). This CRD will reward those who keep up with maintenance. And, it'll destroy those that don't... simply put. Keep proper fluid changes up to date. Clean the MAP. Learn the CRD.
Enjoy the fact that you have a rare Jeep, and prepare yourself for odd looks from non diesel people...
And, get that GDE Tune asap.