Any side wind or riding behind a semi is going to produce buffeting or rather constant rider adjustments to keep the center of gravity under the bike, wind tunnel tested or not. Vision is pretty good and certainly way better than the windshield on my last bike. Even that, though there was some buffeting, beats no wind protection, imo. Goldwings are tunnel tested but they buffet under same conditions.
1 Corinthians 15:57 But thanks be to God! He gives us the victory through our Lord Jesus Christ.
2009 Vision... Lloyd cams, pipes, timing wheel +4, power commander V, gps, xm, centramatics, DARKSIDE