The stock windscreen is downright dangerous. It's tinted, which is stupid. It also distorts like a funhouse mirror. If you think you can spot your braking marker at 190 mph while looking through the stocker, I wouldn't bet your life on it.
I originally tried changing too many things at once. I got a Zero Gravity Double Bubble in clear. I could see perfectly and it offered a huge still air pocket, but it also was not legal for Supersport. I also kept bumping my helmet into the trailing edge of it while climbing forward trying to keep the front end down.
Next I tried the Zero Gravity Double Bubble "Low", also known as the "Drag" version, also in clear. It's the same exact windscreen as the regular Double Bubble, but the trailing edge is cut out in a crescent shape after it's molded. From the front, it looks lower because it's cut shorter. from the rider's perspective, it allows you to get further forward on the bike. It still has a pretty big still air pocket. I liked it. But it also was not legal for Supersport.
If I was buying a Hayabusa windscreen now, I think I'd probably try a stock replacement Lockhart Phillips Speedscreen in clear. The stock-shaped ones are legal for Supersport, and I really don't have any problems with the stock shape- it's just a little more critical to have good body position at high speeds because the air pocket is going to be the smallest.