This is an interesting case and not for the average user. First off the case is indeed a monster of a case. Very bulky, solid, heavy and aggressive looking. It does provide ample protection for drops and rough handling but I would not trust this case in water. No way, no how.
Why? First of all anyone that has experience with Otterbox cases will know how durable the surrounding gel is. Over time the gel becomes worn and loose almost 99% of the time. The port covers DO NOT snap in or screw in like other waterproof cases (Lifeproof being an excelent example). That, to me, is a major issue. You have to securely push in the headphone and charge port covers and even then it does not feel secure enough.
I also had a hinge fall off the iPhone 4/4s version on me while testing it out. It literally came off in my hand. Does not feel well built..
I would steer caution on this case.. at $99 it is a questionable investment.