Financial talk

Hi, I am very interested in buying a car I found on the internet and the seller would like to use ebay motors. Can anyone explain how this process works, what the upsides are, and how reliable ebay is in the entire process. The man I seek to purchase from explained it as so: 1. I put a down payment on the car through ebay and they HOLD the down payment until I confirm its release 2. He ships it to me 3. I check the car out, make sure I like it, confirm to ebay my satisfaction and release the money 4. Pay the rest of the money, everything is alright How does that sound? I would like to hear from somebody who has used ebay motors before Thanks alot in advance