Just traded my 2005 545i for the 2008 550i and it feels like a completely different car. Interior is more luxurious and the car handles much better than the 2005. Automatic transmission is much smoother. This is my fourth BMW and it is by far the best one I have owned.
Sport package, power folding mirrors, voice activated controls.
Replace ashtray with a coin holder, Logic 7 stereo system could be better, more interior color choices/color combinations.