I'm not sure if it was the one we rented or something else, but the ergonomics were godawful. I'm a pretty short guy and I found that there was no lower back support to speak of in the back seats and the front seats weren't much better. Add in what I considered to be weak driving characteristics and an overall just blah interior design and well, it's not the most comfortable vehicle to be in. If the B class is anything like the c230 then it should at the very least be comfortable...minus the rock hard rear seat head rests