I just wanted to throw in my 2 cents. I picked up one of these for a good price on Ebay. I figured it would be temporary until I could find something less hideous and I wanted it for a road trip.
Much to my surprise, when it's on the bike with a Madstad, it doesn't look bad at all! It helps if it's angle is not
parallel to the bike's front end angle. When you're on it, the only time the shape of it is distracting is when it's raining or fogging, then the jaggedness is pronounced. But only from the driver's perspective.
Anyway, I've never ridden a Vstrom without a Madstad, but the windscreen my bike came with was even smaller than stock. I didn't have buffeting issues so much as I had turbulence issues. The wind force would push my helmet into my face in a way that would be uncomfortable after an hour or two. It was LOUD. I always rode with ear plugs, just because anything less and the noise would hurt.
The Vstream has no buffeting issues when you use a Madstad and the wind noise is severely cut down. In fact, the loudest things are now the engine and the roar of SUV tires when they're next to me. Also, tunnels. I can go sans ear plugs for most of the around the town driving. I'll put them in for extended freeway because of external noise, not wind noise.
I get the slightest bit of buffeting and overall noise when I'm doing 80mph-90mph blasts, but even then it's not even as loud as my previous setup was a 50 mph.
I can take my hand and "feel" the wind perimeter. It goes right over my head, gracing the top of my helmet a bit, and clears the sides of my head by maybe 4 inches. I'm 6 ft.
Overall, I'll say: less hideous in person. Very acceptable, even flows with the existing lines. Hey, the Strom wasn't the most handsome bike to begin with
Performance? Excellent. I'll have to try a Calsci someday to compare, but I don't imagine it getting much better.