Just put a Rifle windshield (2 in. shorter) on my '08 Stratoliner and took first ride. My impressions are:
If you can already see over your stock windshield, buy a 21 1/2 inch tall model. The buffeting around my head with the 19 1/2 in. windshield is about the same as the stock screen. The stock height, I think, would pretty much eliminate the buffeting.
Even though the Rifle windshield is over 3 inches wider, you still catch a good breeze while riding. That's probably because there is a greater distance between you and the windshield on a Stratoliner vs., for example, a V-Star 650 or 1100.
The biggest difference with the Rifle vs. stock windshield was riding behind a tractor-trailer. The turbulence didn't feel as dirty as the stock shield. Didn't have that tugging back and forth feeling.
Bottom line: Worth the price to me. Just wish I had gone with the stock height.