Anybody use a Broker?

[socalsharky]

I am in the market for a used 2005/2006 Boxster S. In my web travels I came across a "high line auto broker" who claims to have affiliations with Porsche, MB, BMW, etc. They state that they can get used cars directly from Porsche financial, that have been "corporate driven", and are in "great condition". Their prices seem very competetive, and their service seems much better than you would get at your typical dealership.

I am curious if anyone out there has used such a broker, and how the experience was. What exactly do they mean by corporate driven? Is this a demo car that was thrashed by employees who knew they were driving a company car, or a car that was driven gently by some executive? I know, there is really no way to tell.

My initial gut feeling is that the price is good, because there are a lot of unknowns. Kind of a crap shoot?