AS an LEO I have driven an Impala, a CVPI, and a Dodge Intrepid. Out of these three vehicles the best one hands down is the Crown Vic. In the Impala I felt like I needed a shoe horn to get in and out with all my gear on (I'm 6'1" 195lbs without gear). The Intrepid was just a heap of crap that felt cheap and couldn't run down jack. For my money, the Crown Vic is the best Squad out there. ITs durable, fast, roomy, and its a Ford. I have been told that the Dodge Chargers leave the Crown Vic in the dust speed wise tho. But those same LEO's that drive them say they would rather have a CVPI because of the durability.
I have seen three CVPI's totalled out in chases, and in each case the LEO walked away with minor injuries. If my dept ever switches to another car I'm gonna be one disgruntled guy. My duty squad is an 08 CVPI.