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If, in a sport sedan, you find a level of refinement fully appropriate to your transportation mission, the 2012 Lexus IS 250 or IS 350 delivers that refinement in spades. It may lack the ferocity of a BMW 3 Series (unless opting for the IS F), and falls short of the Audi A4 in high-tech cool but the Lexus goes about its business both quickly and oh-so-capably, and can do so long after its warranty has expired.
If you, like the segment, are moving into the ranks of "mid-size," you may find the accommodation offered by the Lexus IS models too small, especially in the rear seat. And while many buy a Lexus for its Four Seasons-level retail experience, others will find that environment sleep-inducing, along with most of the model lineup.