1. The case itself is so tight fitting. You have to take your phone out of its ordinary case first - even if it's one of the slim ones.
2. The strap is far too short. Even as a guy I don't have massive arms, but I can barely get the strap around my bicep, and it becomes much too tight during workouts.
3. The elastic cable tie is far too tight and is unusable. I end up looping the earphone cable around the unit to control the length.
4. The volume icons are the wrong way up (seriously!) - the opposite way they are pictured in the product!
Basically, this might work for long duration single activites, but it is awful for the gym, where I at least, want to slip my phone as simply as possible into an "armband", and adjust the length cable between different exercises. This thing quickly becomes annoying.
I guess the fact that this is called a "jogging armband" should have given it away - I didn't think it would be that literal!