Alot depends on how tall you are, i have a Givi screen which is 10cm taller than stock. It does make a difference but is not perfect. I also have a Touratech spoiler which is lockable. I use the Touratech ontop of the Givi and its much better, although you might not like the fact that it does obscure your view a bit. I am 5ft 11 . Givi was �63 and Touratech was about �90. Dont forget that sometimes you want some air going over you when it is hot, so it depends what riding you do , and what lid you wear aswell . I have an Arai Tour X3. Also you get lots of air coming up under the forks so even if you do the screen that will still cause problems. Check out the threads on that as there are some cures.