Well, my suspicions were right about this engine in a Cabriolet, imho of course. It's ok once you're moving but manoeuvring it around was almost embarrassing in an underground car park. Transit like, well sorta.
No complaints about performance or economy at all though. It was even more economical than the same engine in the C-Class somehow. This car only has a couple of thousand miles on it as well. 70mph equates to 1600rpm in 7th, and in D and M modes will stay in top and pull it nicely and even gather speed at an acceptable rate. In S mode it'll drop to 6th smoothly if you give the throttle a gentle prod.
Complaints about this car.. sun visor is made of sandpaper or something, and each time I grazed my head against it (often) I'd leave a streak of skin particles embedded in it.

Obviously not just me, as I has wondered what all the marks were on it, now I know, other people's skin
There was an annoying trim creak behind my right shoulder which was really annoying.
Scuttle shake is apparent over rough surfaces, but not nearly as noticable as my Brother's S4 Cab, but more so than the SL I had recently.
Handling is really good, but as with most modern cars the steering is pretty void of feeling though precise and nicely weighted.
Nice things, I like the way you get handed the seat belt when you insert the key. I like the AirScarf feature, I like seats also.