Just traded in my Lexus IS250 for a 09 328i. The Lexus ran smoother, but the BMW performs way better. Can't really explain it, but the car seems to know what you want it to do. Everything about the car feels tight and just right. If you want a smooth cushy ride, go with the Lexus. But if you want exceptional handling characteristic's and a car that is fun to drive, the BMW is it.
Car handles exceptionally well. Feels very refined.
Interior storage space is lacking a bit. but hey, you don't get a BMW to store stuff, you get it to drive!