His question gave rise to this analogy: I am planning a party, and I am super busy, and need discounts because there are a lot of mouths to feed, in addition, I can't cater it myself, because my other responsibilities are more important. So, I call a reputable concierge or catering service from the internet, and ask, "How are you different from Target?" They would be scratching their heads in confusion! Apples to oranges! Where do I begin?
Let's discuss car buyer's agents in general. A good one works for you, and you only. They do not collect a "kick back" from the car dealer. Whatever you pay out to the car buyer's agent, you will get back tenfold in terms of both time and money savings. They (your car buyer's agent) get a clear idea of exactly what kind of car, truck or SUV you would like to purchase, the price range, new or used, and every last detail regarding your requirements and desires. Then, they go to work on your behalf. They call dealers, research vehicles, and find you the very best deal possible without sacrificing any of your requirements.
Cars.com, Autotrader.com, TrueCar, and other car buying sites advertised by credit unions and Edmunds.com provide a useful component to your search, but they can never replace you, the car buyer. A car buyer's agent, in essence, becomes, you the car buyer, and operates as if they are meeting their own needs and spending their own money. In this way, you, the client, has your requirements met. It is your agenda that is top of mind and not the car dealer's agenda. Always a good thing :).