To buy a Demo or not to buy?

Ok, so here is the dilemna.

My wife wants a mini, but she wants the purple haze color, they stopped
that color this year.

We managed to find a 2006 early model Cooper S in Purple haze, it is a
demo car with 753 miles on it.

The dealer says that this demo has been driven by the same salesman for
all the miles it has on it. I'm told Customers test drive other cars
that eventually get sent back to the factory and are not sold to the
customers.

The Salesman I that drove it I talked to, he says he broke it in very
well, he seems to be a mini enthusiast.

My question is has anybody bought a mini demo before and what are your
thoughts on buying one?