Besides the obvious visual "wow" factor associated with the car and the Back to the Future franchise, they're surprisingly inexpensive for such an iconic car. The main problem with them is that Delorean Motor Company didn't really follow the concept of "model years," instead changing things as they went along, so restoring one to original condition is practically impossible. I was also not a fan of the aluminum engine block, since, if it ever got just slightly too hot, there's a good chance it would be ruined forever.
My second choice vehicle, BTW, would have been some kind of van painted up like the Scooby Doo Mystery Machine. :)