I had the Yamaha Touring windscreen on mine for 8800 miles. Massive improvement over the stock unit although still not quite perfect. I'm 6'2" with a long torso and even with the windshield in it's highest position on my GT I still got some buffeting. If I were a couple of inches shorter it would've been perfect!
I'm also looking to sell 2 Touring windscreens. One is new in the box and the other has some slight scratches that may buff out. I'm not able to post in the classifieds yet but feel free to PM me if interested. Parts in Marietta, Georgia, USA.