I am thinking of replacing my '06 325i with a 5-series x-drive, as I now have a long commute and live in Wisconsin. Looked at an '07 530xi, which is a lot softer than my 325i (stick/sport package) but I figure I could improve handling (in the summer at least) with 18's and summer tires. What troubled me the most, however, was a feeling of some lag between pressing the accelerator and accelerating - almost like turbo lag. Once over the initial lag, power and acceleration were good. I wondered if this was due to the transmission having to learn a different style, or is just one of the car's characteristics. It's a CPO with 44,000 miles; dealer is asking just under $33,000. They have an '08 535xi that wasn't available to test, but HPFP issues concern me.