I've owned my IS 250 for 3 months and now really appreciate its qualities. Thought the car a little boring at first, especially compared to my wife's BMW 325 convertible. No doubt, the 325 is more responsive in all respects, but especially the steering response. The IS 250 is way too light and can be a little difficult on all but the smoothest of surfaces. As far as everything else is concerned, it's no contest. Gas mileage on the Lexus is far superior (a recent 700 mile round trip from Sarasota to Key West resulted in 35.5 mpg). The overall mpg over 2200 miles of ownership is 30.5 mpg. The IS 250 has the looks to turn heads.
Looks, keyless entry, quality of materials, cabin ergonomics.
Headroom a bit tight, even for me at 5'10". Rear visibility poor, excessive tyre roar.