Tip for the guys going to use this as an exercise partner - get bluetooth earphones (a co. called Jaybird do some, they're not amazing, but they're okayish. Just don't pay RRP, find them in a sale).
It's massively irritating and goofy to run wired earphones from your armband up through your running shirt. Wearing the armband on the outside of a shirt is the other option, but it's super goofy and you'll need to find a way to tuck the lead in.
BT LE earphones are definitely going to make a big difference to the overall experience and reduce setup time when you just want to get up and go.
I've made a number of posts against using phones as an exercise partner, but until I was ready to commit to a real GPS watch, I actually ran with the iPhone 4 and tried lots of diff. options including armbands.
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Why would I 'move along now'? Because you don't like what I'm saying about Apple being behind Samsung in making waterproof devices? Why does it trouble you do much that my opinion causes you to try and get me to go away?