Had a Windjammer years ago and now ride with a Parabellum Scout on my R1200R.
Windjammer is heavy, bulky and in my opinion not very attractive. Puts too much weight forward on the bike and is not good for handling or riding on rough terrain. Also limits visibility of the road up close.
Parabellum Scout is so light as to not have a noticeable affect on the handling or suspension. I have never felt like it was causing an issue when riding in the wind and boy do we get wind. I think it is good looking on the bike, certainly more contemporary than the WJ. They are very well made and provide good protection for the torso. With handguards and tank panniers mounted it can provide very good protection, or you can put a low screeen on and have the look of a cafe racer.
An Intrepid Incompetent
Team Pterodactyl Montana Outpost
Canyon Creek, MT USA