I've waited to review until I used it in both functions. Install was easy even without pictures. (Recommend sending pictures with instructions) I did need to contact the company to explain how when in the half position was held down. They responded with pictures that made it make sense in my small mind.
While in the folded position it seems to be secure even at short bursts of 60mph. The seam where it folds somewhat blocks your line of sight for technical riding but a quick adjustment of my body i can see what i need to see. for faster riding its not a problem.
I tow it in an enclosed trailer so I can't speak to durability while towing on an open trailer.
In the up position it does get dusty quickly so be prepared with some micro fiber cloth and cleaner. I only use it in the up position for winter ridding anyway. The folks at the company were quick to respond with my inquiry and were very helpful. Shipping was fast too. I am very happy I purchased this windshield.