Owned my 2005 530i for 3 years and never had one problem with it. Drove like a dream and always loved driving it. I put on about 12,000 a year mostly city driving and it performed great. A little tight up front (I'm 6'3) but overall the space inside is good. The interior design is very good the bluetooth always worked great with my phone and IDrive didn't bother me once I got used to it. The cup holders are ok they're not to bad never had a problem with them. The car is also very safe I got into an accident and the car held up great. Just recently sold it with 57,000 miles I upgraded to a 2008 535xi I hope I have the same luck with it !
Handling, gas mileage, performance, exterior design, xenon lights + halos
Better traction in rain, seats that go back further, better quality plastics (all was addressed in 08+ models)