Own a SP3 Pro and have decided to upgrade to the SB2 13",i7, 8 ram. However, I am seeing numerous comments of moderate to very severe coil whine when the SB2 is charging. Many adjust the performance setting to reduce with mixed result. Hence, I did not hit the "buy" icon. Is this still an ongoing issue problematic to the 13"? At this point, I may do a store pickup and test the whine on site. Totally kills my enthusiasm, as I work in a very quiet environment. Anyone?