As far as I remember, Lufthansa flew the -400 in for quite a few months with no problems (apart from running one of the taxiway signs over on the way off the runway).
In fact one landing only touched down around 2/3 of the way down the runway (on an evil 20kt x-wind, gusty day) and still made it off the runway by 'B'.
The only real problem at City with the Q400 is the parking, as it requires push back onto stand!