That's definite Stu, the brakes lights don't come on when the car decides to recoup energy and brake itself? It's a question I've been wanting to know the answer to. I asked it of myself again on the M25 when the car did it's stuff and a Transit got closer than I would want and have expected. Might have to use the foot a bit more if I know I'm being followed. Given the strength of braking it doe's seem an omission at least when in full use. At it's mildest it's like gearbox braking on a manual so not so bad.Thought I would post my thoughts having now had my C350e for 6 months and just before it's first service at 16000 miles.
I ordered a C350 Premium Plus in White with Privacy Glass, Grey Artico and Black Ash trim in June 2015 and the car arrived at the end of February 2016. This was ordered through Mercedes Fleet and had no issues with getting everything working.
Fantastic looking car and cruises nicely but no sports car.
This was bought as a Company Car to reduce tax and is charged at home daily as well as in London when I can get on to a charging bay - I did not get a bespoke charging point as I did not think the cost justified it as I would always have a couple of hours to charge or overnight. I have the 8m cable and plug the brick into a socket in my garage with the lead running under the door. I have had no problems with charging/overheating.
I had Hankook tyres and the rears lasted over 15k miles - the fronts are about 50% worn. Only issue I had was a puncture which resulted in the tyres being changed but this happened on a Sunday and the only place I can get my tyres changed is a Mercedes Dealer who are closed on Sundays and then quoted 3 days for new tyres! Miraculously they found some (after a fair bit of 'conversation') and this changed to 3 hours.
The longest run I have done is from Milton Keynes to Aberdeen and averaged 44mpg and I can get high 50's on a run to London when leaving at around 06:00. Lowest figure I have got on a tank is 35mpg when I have been playing but for the power available not too bad. My average journey is around 50 miles and I get mid to high 40's mpg.
Downsides - small tank so a lot more stops to fill up so planning the journey not to be ripped of on the Motorways - don't like Sport Plus, very jerky without much benefit - brakes vary in how they perform - in eco mode the car will slow down if it detects a vehicle in front (sometimes quite quickly) however the brake lights do not come on and this has nearly resulted in some rear end shunts - best I have done on a full charge is 8 miles (maybe me?)
To date I have had no issues whatsoever with the car and would recommend to anyone.