I use the VStream year around, was not happy with the stock or CB Euro Tour. With the VS all the way down, you can get plenty of air, up good protection...don't know about impact on passenger, as I ride alone. The shield does vibrate a lot at high speeds or when you are in the wake of a big truck, but that has not been a problem for me. At 6'0 feet I look over the VS, so I get right much wind noise into my helmet - I wear ear plugs to cut down on the noise.
Despite the negatives, I like the VS. However, if I was in the market, and since I have tried the CB and VS, I would probably look a CalSci. A lot of forum members seem to like that one.