I test drove both the 28i and the 35i more than once.
I am totally pleased with my new 35i as to steering and engine. In fact, I find the growl of the N55 engine to be great sounding, and I have had others comment on that already. I think my car is better than either of the demo cars I drove.
If one buys something without driving it, and then complains they don't like it, I think you only have yourself to blame. Guess one must have a lot of money to buy an X3 without a test...??