I am rather tall (188 cm) and stock screen gave me terrible buffeting at speeds over 95 km/h, limiting me in comfort on highway travel.
This screen works great for me. Installed in the highest postion holes in the bike fairing (out of 3) it does not interfere with handguards at steering lock. Buffeting now is GONE!
Variable upper part postions are not trivial to figure out. For me, the best settings are either full down of fully extended.
Lowest setting work great for airflow to the helmet, is lower than stock and great for speeds up to 110 km/h.
Highest setting reduces airflow but eliminates buffeting completely, making it very comfortable for any speeds up to 145 km/h. As a downside - top of the screen is just velow eye level and filtering gets scary as you have to rely on looking through the winshield, which gives sove distortions near the edge.
I tried many screen positions in increments to find the best one for me. Feel free to experiment.
Great quality product.
One thing to be aware: it comes with washers and bolt, but you must reuse stock rebber nuts that go into the fairing. I would suffest ordering extra M5 rubber nuts together with a new windshield.