Got mine after reading this thread. Pluses - very robust, dirt and dust proof for sure. Standard headphones fit just fine, but there's an o-ring headphone jack extension cable that allows you to retain the water proof capabilities while plugged in. The size will take some getting used to, but it's far more substantial now with that case than it was alone. The only issue i've had so far is that downward swipes are harder to trigger. There is too much plastic above the notification area, so it's hard to grab it every time. Otherwise, its a winner.
I ordered one on Friday for my new S4 and I can't wait to receive it. I watched a few vids on youtube and I see that they tell you to remove the screen protector on the phone. I am very anal when it comes to scratches on the screen so I wonder if I can put a screen protector over the screen on the case?