This is one of three Quad Lock products that I own. The quad lock mechanism works great on all of them. I have used this on my road bike and my mountain bike. It stays securely on the rails and I've even taken a fall with it without damaging the phone (it barely bounced, in fact). The case is thicker in the middle than Apple's silicon or leather cases, but it's a very smooth transition to a four-lock bar. I use the case every day and it fits easily in and out of my bag. If I want to be very critical of the case, I can find that there is a dividing line on the front edge of the cover, which I don't want. But overall a good case and a great mounting system for almost any application.
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