I own a 335i and had it from new absolute pleasure to drive loads of power fun and apart from the rear demister breaking down this week in 4 years it has been bullet proof no faults what so ever.
The only downfall i'm afraid is rear weel drive cars do not like the snow at all to make it worse mine is auto I have not used mine for a week because of snow and ice on my road will not take traction at all.