I can't say I've ever owned a BMW or Audi (though I have driven them), so take note. I can say, however, that I love the IS 250 AWD. Looks great on the inside and the outside and drives well too. It may not be the 500HP BMW M5, but it has zip and the handling is phenomenal. The fuel economy is a bit on the low side, at about 22MPG for my driving. In extended highway driving (even avg. 90MPH) I've gotten the avg. up to 27.5mpg, so I think that the 26MPG # is a bit low. No complaints so far... except that it's too damn much fun to drive.
Handling, AWD traction, quietness, keyless drive.
'tis a bit tight in the back and needs a light in the trunk.