Same here. I personally would never buy from a rental deal.
Just for example- I had a buddy in college who once was broad-sided in his car. So, he had to put it in the body shop for a couple of days, and the insurance company spotted him a rental mini-van (for some reason, I don't know.)
This was over winter break, and so he had some time to kill. He drove his rental van to my house (about 120 miles). We decided to hit up the local pubs, and so I got into his van to drive there. Asked him "How do you like the soccer mom-mobile?" He said- "Not too bad, but it is a serious dog. Very slow, and feels like I have to put a lot of gas into it to keep it running down the highway."
No big deal. As we were driving, I kept hearing a high-pitched squeal/whine from the van. It bothered the heck out of me. I asked him what was making that sound. He had no clue what I was talking about. I was looking....looking...looking. Then I noticed that his PARKING BRAKE was about 3/4 of the way down! I told him to stop and pull the PARK BRAKE lever, to which it then released. Needless to say the van now was a smooth-running FAST machine. He had driven the van for over 120 miles with the parking brake set.
I will NEVER buy a rental, because I know at some point every rental has had an "Eric" drive them around.