I actually have a limousine version of this car, which I used as my daily driver for a year and a half. Even with the extra 5 foot stretch on the body it still manages to move itself well with the 5.7 liter engine. Accelerating quick around corners and out of stop lights is mighty fun when you're longer than even the biggest SUVs around! Adding custom stereo equipment was easy (including running wires to the trunk and access under the dashboard). Even though the car is in great shape, lots of repairs have accumulated over the years including water pump, steering pump, fuel tank, hubcaps (they started to squeak and chop up the valve stems), and rear axle (blame that on the extra limo weight).
It's a big smooth ride. The square styling you just can't get any more, and the grille looks like it will eat you and wash you down with a martini. It has room to hide upgrades (my two amps fit into one rear quarter panel with no modification of the trunk liner... there's a lot of space in there!)
Fuel economy is horrible (especially when the car is stretched!). Front seat belts are mounted on the door, which isn't safe when the door crumples during a crash. Forget about airbags. Keep it rust-protected and rust won't be an issue.