I run 3 miles, 3 times a week. I had used some sports arm bands but was never really crazy about them, either due to the plastic cover over the iPhone screen, or because the armband broke much more quickly than I thought it should. When I saw the Quad Lock Sports Armband, the concept looked great, and I especially liked that I could use the same Quad Lock on my bike, the iPhone case fits and locks on both the same way. This arm band works perfectly, and is really made well. I've used it at least 3 times a week for almost a year now, and it's in perfect condition. I can't imagine it falling apart. The iPhone is completely secure once you hear that click lock. I've never had it come off the lock.I can't say enough good about the Quad Lock Sports Armband (and the bike mount). As far as the iPhone case from Quad Lock goes: I thought I wouldn't like it as much as the very slim iPhone case I had. I don't like a bulky case. I thought I'd be taking the Quad Lock case on and off and using it only as needed. It turns out this Quad Lock case is almost as thin as the case I had - so much so that I have never taken the Quad Lock case off my iPhone, I love it. Quad Lock is such a well thought out product that works perfectly.