I had read bad reviews about returning your leased Mercedes and when mine was due back I was so worried. I was so certain that they will make any excuses to charge me. The day came and a nice polite gentleman came to collect it. He did not make a fuss about anything and I was not charged a penny! I had looked after the car really well and before returning it I cleaned it so well it looked almost new. Now that I have had the experience, I think those people who have written the negative reviews have probably returned their vehicle in not a very good condition and expected not to be charged!