Good cover, resistant to severe vibration, for fixing purposes handlebars, attention to mountain bike handlebars

The cover itself seems very well protect the phone. His zipper is waterproof (I washed my bike with water leaving the handlebar, no phone inside, inside remained dry. The cover comes with shims to keep the property landline phone in the pocket . Even with a big phone (Galaxy Note 2) they are very helpful. I place my phone in with the "flip cover" without worry.
The screen remains usable. The touch buttons on the bottom are a bit more difficult to handle but it works.

In the amount I was shocked that fixing the handlebars was incompatible with the big mountain bike handlebars (28mm). I had to place it on a thinner part (22mm) of the handlebar. The indications of the description at the top of the product page incorrect so (impossible to attach to handlebars 30mm ...) 2 layers of rubber are used to adapt a little size (18-24mm probably)
The ball joint allows to orient the phone on the handlebars. By cons, once properly clipped, the cover is difficult to remove.

I made a first outing with mountain bike today. I was pleasantly surprised by his behavior. Certain portions of the trip were very brutal (rapid descent with large rocks, jumps, many shocks, suspension mountain bike on a 120mm front and rear.) The cover has not changed position. I was pretty confident!

I'm generally pretty happy: I can use my big phone (Note 2) as GPS.