Chris.
I picked up my B class 200 on Monday,
The engine has effortless power and the gear changes are smooth (obviously I Havnt tried harrying it ).The tech in premium plus spec is mind blowing and augmented reality navigation which shows a live feed of the road with blue arrows telling you where to go is more than a gimmick.
One other thing I had heard about but couldn’t tell if it was on the car from the brochure is that you can slide the whole rear bench forward to give you an enormous boot.(60/40 split).
andrew