Awesome car, got a CPO after coming to the end of my '99 328i lease. Powerful and quiet, it does everything with a touch of class (even beating the pants off a CLK430 the other day :D ). I didn't buy it for the cupholders or fuel economy so really the only thing I could complain about is the standard stereo system... could be better, not quite crisp enough, gets too mushy at high volumes. Other than that minor detail, I love this car! Went through an adjustment period after the 3, the 5 handles much differently being quite heavy but after the last 5 months I'm hooked.
Transmission, engine, lack of road/wind noise, electronic amenities.