Yes I agree with going one size up on the Madstad. I got the recommended size and I still had a little wind hitting the top of my helmet. I made new holes to raise it about another 1.5" and it's almost perfect now.@Laurentbr,
I'm 180 cm tall. I had an 18" Madstad on my 2017, and it was clearly not tall enough for me. Before ordering, I actually called Madstad and spoke to a person about the sizing, so I hoped it would be correct. I ended up returning that screen and getting a 20" version. Even from Canada, the shipping and 15% restocking fee made the replacement quite expensive.
If you go with a Madstad, I personally recommend that you get the next size up from the size the chart recommends. As per my post above, I also found the Madstad needs an additional spoiler lip to really work well. I think my experience matches that of @air-ick above.
Each person's experience is different, but windscreens are expensive, and changing them out is an expensive hobby.