I did go through a bunch of the threads here and elsewhere, and the GIVI seemed to have the most positive reviews with the fewest negative comments overall, and it's priced $50 - $100 less than the others, so I tried it with the stock mounting bracket.
I came from an old Honda with a huge National Cycle Plexifaring which kept me in a nice quiet bubble with just a nice breeze on my face - so I couldn't stand either the horrid buffeting nor the LOUD wind noise associated with any position of the stock V-Strom windshield. Taking it off got rid of the buffeting, but the noise was unbearable and forced the use of earplugs.
The GIVI at the highest 'legal' position of stock bracket gets rid of the wind noise (I can actually hear the motor now), allows me to keep the face shield up even at 55-60, and prevents buffeting for almost all speeds except for the occasional shake on the freeway when there are various crosswinds. I do look through it, but that doesn't bother me. Does it catch the wind? Yes - but not to the point of being scary, and, frankly, I think the sail created by the faring is a much bigger issue than the larger windshield.
The Madstad brackets get almost universal kudos, I just haven't decided if I'm willing to blow another $70 since the GIVI gets me about 95% of the way there...