I'm 5'10" and I use a 6in Dakota Dark smoke shield in the summer and a 12in Dakota Light smoke sheild in the winter. The 6in gives me plenty of air on hot days and better vision as I look over it by about 3in. 12in in colder weather for obvious reasons.
im 6'1" and i have the HD windsplitter windshield. i think its 7". had a klockwerks 8" on for one ride and thought i was going to die. the vision was so distorted looking thru the shield at times you couldnt see a thing. went home took it off and put the stocker back on till i found the windsplitter.
There must be quite a bit of difference in the seat hight on an Ultra. On my '04 I have a HD 10" and look over it, and I don't stretch to do so. It came with a 12" that I looked through but could stretch to see over. I am 6 foot.
you do sit a little lower in the saddle on a SG not that i looked thru it all the time just in curves and looking at the road right down in front of you. really freaked me out not clearly seeing were i was going.
I am 6'2", on the stock seat with an LRS 9" light grey (?) standard "flip" windshield and I love it. I get some air "floating" around my eyes, but even in 30 degree temps, I don't get blasted and my eyes don't tear up at all. I hate looking through a windshield and this works for me.
I have tried multiple sizes, found that a 15" Memphis shield works best for me. I am 6' even, short legs, long torso. I am looking through the shield, I was looking over the stock. (I have a Road Zeppelin seat that does raise you up about an inch from stock.)
It works so well, the ugly factor went away after the first ride.