Toying with the idea of an S-Class W221 at some point. Thought I'd put myself off with a notional insurance quote and it was fully comp for S350 CDI at £520. Not too shabby. Ok, it fits on my drive (just), tyre prices not too bad, tax ok and the press heap praise on it. BUT, I see a few negatives online such as nightmare of gearbox failing at cost of £12k and talk of vibrations (excessive) at around 65mph and upwards. Really? Anyone heard this?