I'm one of those guys who always has to have the latest and greatest, so I got one of these VStreams to replace my Calsci large. Boy, my experience has been different.
The VStream is a nice shield, but after 150 miles on the vstream, I'm back to my calsci. The vstream has less back pressure than I remember the stock shield having, but the calsci has no back pressure at all. the calsci is quieter, and the air behind it is more calm. The vstream makes a bunch of wind on my arms and ribs that aren't there at all with the calsci. Also my wife complained about the vstream making a bunch of wind on her arms and sides compared to the calsci.
I don't know about this one size fits all thing on the vstream, either.
I got $60 for my Cee Baileys windshield from the calsci people. I wonder if they'll give me $60 for my vstream.
I'm 6'0".