I think the trouble with the Bammer is that there's a really large volume of moist air inside to shift. Couple that with the fact that the climate control won't take moisture out of the air below 5 degrees C - and we have difficulties at this time of year....... If the cars a bit damp inside, it'll be hard to shift.
Mine hasn't got heavy condensation, but it'll 'steam up' a bit with people in until the heaters blasts it away.