I installed the 17 inch Gustaffson windshield and it's too short for my needs. I am 5'10", and wear a full-face helmet and 33db ear plugs. I have hearing loss, tinnitus and hyperacusis and
need to eliminate as much wind noise as possible. The 17 inch did eliminate some, but not all, of the hurricane in my helmet. If I crouch down a couple of inches behind the 17 inch, all noise goes away.
Now I know why they offer the 20 inch version.
So, the 17 inch may go up for sale so I can try the 20 inch. The quality of the windshield is fine, having it mount to the BRP brackets and look OEM is great, and the installation is not difficult, especially if you have a helper.