I have the GT, it's about 22". Works great for me at 5'10" but it might be a little too short for anyone over 6'.
It's not an easy install and once it's on it would not be an easy on-off.
I bought the Calsci windshield and returned it after a 10 mile test ride, pure junk IMO. Now I'm running the Secdem windshield and it's 1000% better. Very solid 3 point mounting and it fits the contour around the headlights.