Experiences using Hertz Rent2Buy to buy a used car? Anyone bought one before?

I am interested in a vehicle I saw advertised in Atlanta by Hertz Rent2Buy. Since then, I have been researching this program and think it is interesting. I am posting here as I think others may be interested and I would also like to hear if anyone has had an experience with this program.

Basic Premise: Hertz sells late model rental cars to the public at roughly the same price they are getting at auction to avoid transportation & auction fees. The customer rents the car for $49/day for 3 days to test the car before buying. During those 3 days you can inspect the car, etc.

The prices are quite competitive and are "firm" from what everyone tells me. There doesn't seem to be any room to negotiate and if anyone has been able to negotiate I am curious how they went about it.

I am picking up the car tomorrow morning and I will update this thread as I go through this experience with my thoughts and ideas in case anyone else is interested.

A few of the downsides of this program are that you're buying an ex-rental car which has likely been driven rougher than average. Many of the cars are rather new but have a lot of miles for their age. On the other hand, I take some comfort in the fact that the routine maintenance has been performed regularly and many are still under factory warranty.