Rather have Acid look at a potential car, over a PPI company, Acid knows these 55 cars inside out, (think you know this already John), he will tell you, good or bad. Best of luck with it.
First time i went to see Acid and his brother, they have helped me so much that when i decided to have my 55, i was hell bent on going to the dealer to have my work carried out and now i'm hell bent on Acid looking after my 55. I trust him and his brother more than any stealership out there.
Mercedes Benz UK - Take a good look at how customer service is supposed to be, you will learn a great deal from MSL!!!