Saw one today, they're pretty bad-***. Lots of mod-motor parts for them too. They kinda suffered from being a little overpriced IMO. In the end it'* just a crown vic with a nicer engine, and some cool wheels/exhaust tips.
$20k is a lot though IMO. You can get into a Charger/300 for a little more then that with a v6, with a warranty and no cop car looks.