I really was worried this would be a junk product. I installed and tested it with an older junk smart phone. At just over 80 mph noticed no movement at all. Took the bike back home grabbed my phone and took a few shall we say test rides. Then hit the freeway and repeated my 80 mph test. The iPhone was bigger and it was still holding well in place. Now I don't suggest this but I opened the bike up to over 100 and still held not a wiggle. As I usually ride slow and easy im sure my bike was saying really knock this off. But I'm confident in the product. Even came with extra tie downs so I'd they begin to become questionable you can change them out.
Well designed and prefect for me.