I dont really get why people slag them off so much. Like any dealer, you go and take a look at the car/s your thinking of and make your own mind up. Ive been a few times while passing just to be nosey, and they do have some nice cars and some not so good ones. Im talking about escos' here, so your always going to get a variation of quality from car to car, just like you would when your looking at private sellers cars'.
Dont quote me on this either, but im sure they also sell cars on behalf of customers and take a cut or mark them up to make some money themselves. Nothing wrong with that though as their in it to make money at the end of the day.
I also beleive that they offer good warrenties with their cars (or most of), which is why some may seem a little overpriced to some. Ask for no warrenty if you want and im sure they may knock a chunk of money off.
Go and take a look for yourself mate and make your own mind up.