Most Police vehicles while in service are normaly quite well maintained.
When looking to get an ex-police vehicle try to avoid 'city' patrol units.As they are normaly rode hard and put away wet.
The best to look for would be State and small town Police cars.County Sheriff cars are ok too,it just depends i guess.
Oh and yes that is my '04 9C1.It currently has 105K on it and runs and drives great.It has a stupid stiff suspension,torquey motor,and the 3.29 gears really help get the car going in a quick fashion.
In all honesty though,my last car (2003 P71 Crown Vic) was a much better all around car.I just wanted to try something different for a change.I mean i have owned 7 Caprices and 5 Crown Vics.Needed a change of pace.