I'm 6'2" and yes I am happy with them, definitly more wind in my face with the short one, but both are like having a windsheild that is an inch or 2 taller than it really is. If you get to any big event, Klockwerks will put one on your bike to try.
I'm 6'2 and was concerned about the 6.5" Klock Works not doing the job because there was a lot of people shorter than me saying that the air hit them right in the face and was very dirty . I went ahead and got one of the shorter ones and all I can say is mine works fantastic. I have a C&C seat which lowers me about a inch so maybe thats the reason mine works so good.
I have a tinted 10.5" thats either going back to Klock or going in the classifieds, rode it for 5 miles and had to go back to stock..Im 6'5" and have a mustang solo seat which lowers me and puts me back. I was looking through and not over the screen. Id love to try the next size down now
Got one when it first hit eBay. Total waste of money. I'm looking through, not over. I'm running a 6' 5" one and it make the bike handle better. The 10.5 does nothing for the handling. I cut 2" off the bottom trying to get it low enough to look over. There's a post on it somewhere with pictures.