Not a problem, more a sensation.
We get some pretty good wind storms out here, gust over 50. They become even trickier when they get channelled through canyons and gorges. Then there is a fairly common 40+ mph crosswind at 60mph and meeting a semi doing the same in the opposite direction on a small two lane road.
The Spyder does great, it holds the road just fine. I find I get slapped around some, but the bike is a "stable platform" to hold on to. After one very windy ride a couple of weeks ago, I found my knees and thighs were a little sore from the workout they got, but no dents in the Spyder.
On my motorcycle, the body seems to take fewer 'hits', but it does not feel anywhere near as stable and seems to jump or get pushed one way or the other.
I agree with Dannys's comment about hitting the wind head-on. Sometimes it seems like the brakes are being applied or you are downshifting, but it is not unsettling in any way. On the other hand, with a 50 mph wind at your back as you are riding up a canyon is an experience in magic. Leaves, weeds, and papers seem to be frozen in space, almost like they are floating there in Zero Gs with you and all you hear is the engine and the tires on the road, while the canyon walls are flashing by.
I would add that I have a smaller windshield - the RoboBrackets and shield by MadStad.com . This is nowhere as big as the other adjustable shields and does an incredible job of eliminating or reducing turbulence. I used to have a large CalSci shield and that did act like a sail every so often in high winds, but never enough to effect stability or steering. I am 5'7" and weight about 140# if that helps.
Bottomline: Spyder stable, driver can get pushed around by sudden high wind gusts. I love it.
Tom