i think these large dealers that sell volume tend to be better for the comsumer, (i'm only going off of my recent experience) especially in terms of price. West Herr owns a ton of dealership in the buffalo and rochester area. i was told that last year they sold over 50,000 cars. the dealers include all brands such as ford, chevy, bmw, mercedes, etc. they really seem to feed off the volume, and will get the cars off the lot. i went in to look at bmws recently, and they did everything they could to find me ways to get incentives. they asked me where i worked, went to school, (you could get discounts on both depending on the answers) offered me a solid deal on the trade in, and ultimately told me to give them a price that i felt comfortable with, and they would find a way to make it work. they just wanted to sell cars, and because of that, the place was packed. there wasn't an available salesman, so i had to make an appt to come back.
at another dealer down the street, who is not part of a large group, acted like it was lucky to be there, offered me the least on my trade it, and made me wait for 45 mins even though i had an appt. i didn't go back.