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I currently have an N55 in my 2011 E90, and it is a nice motor, but mine feels coarse at times compared to the N52 I had previously. It also has a fair amount of throttle delay between applying the throttle and the engine revs actually moving. I ended up purchasing the PPK1 to help with that issue.
I keep hearing that the 2014 328 sounds better than the 2013 (I found a number of threads). My recollection was the same, but I would like to be sure before placing an order. It's not easy to find a friendly dealership in Michigan that is prepared to put in the time and effort.
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