Having a 2012 135i, I recently test-drove a X1 28.
I just ordered the X1 35 to replace the wife's X3. Why?
While the N20 in the 28 was peppy, the N55 in my 135i ALWAYS puts a smile on my face!
From your list of things missing, aside from the engine, the Xenon's and the auto-dimming mirrors (kinda like rain-sensing wipers) are like oxygen. You really don't notice them until you don't have them. Then you really miss them.
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