The MS windshields are great. The quick release system works well, they look good, are easy to mount and they are priced well. Like Ed said... you can go with one particular shield, them switch later because the hardware remains the same.
Buffeting? You won't really know until you try one... there are just so many variables such as rider height, screen height and width, type of helmet, leg position (short vs. tall people changes wind deflection over the knee), etc. If buffeting occurs, you can add MS lowers which cures most to all of those kind of problems.
