I echo NMK's for the most part. I bought the SATV flip windshield (and soft rear window) and I mark it as one of the best investments for the moto I have made. The split point is lower down than a half windshield and isn't in my line of sight and I've never been accused of being tall.
The dust thing however, varies. In Moab I did a few experiments on dusty roads and at certain speeds a closed windshield is better at dust control but when speeds reduce under 30 K, 20 MPH the dust starts to swirl in, mostly in the door gaps of my stock doors. In rain of course the windshield is worlds better closed. (ya think? ) and when it gets chilly I open the windshield in order to see what it would have been like if I didn't have it, and I shut the sombitch right away again. Brrr...
I have to say my initial fears it would be fragile due to the opening ability and living on gas struts, but that has proven groundless. I have had the SXS loaded in the pickup and forgot the window open and it has tolerated highway speed wind without change.

Not a smart thing and I wouldn't have knowingly tried it. The windshield is pretty much level when fully opened and I guess it must knife through the air rather than generate lift, or not much lift.
But it must be said, nothing I have tried is as clean and interior dust free as no windshield and no rear window.
Another bonus, me and 5 quadding buddies went down a road/trail after an early snowfall and heavily snow laden branches hung across the trail constantly for a mile long stretch or better. Window open I ate a few lapfuls of snow before I shut it. I took the lead because of my having the windshield and I was able to brush on through with basically no more getting inside. Here I am at the stop where we have dropped below the snow line and the benefit of the windshield should be obvious. This resulted in no detectable scratches I have to say.
If I hate to say it, still I'd advise eating the half windshield and getting the flipper.

It's that much better having the options.
