I put it on for about 5 minutes and here are my thoughts.
Pros

Not as big / heavy as the Otterbox commuter.

The lip around the screen is nicely protective.

It looks cool and unique (I got the metal slate)

The webbing on the inside is a great idea for dealing with heat from the phone
Cons

Open hole in the back (this can be fixed by putting on a back screen protector)

Buttons are not as responsive as I would like. The apple leather case is much better in this regard.

The back plastic piece is slippery

The back plastic piece has sharp uncomfortable corners.
The last two are deal breakers for me.. The case makes the phone uncomfortable to hold and slippery enough to cause me to drop it more often..
Because of my last case from SGP and all of the great reviews, I was honestly expecting more from Tough armour.
I had the SGP Ultra thin air for my iPhone 4s. One of my favourite things about it was the rounded sides. It also had a glossy plastic that didn't slip out of my hands easily. With the Tough Armour you gain protection but lose those attributes that make it a pleasure to hold and keep ahold of..
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5 minutes later it went back into it's packaging and the apple leather case back on the phone.. I really like the leather case. However for those times I feel like I'm going to need more protection, I'm still looking for a better solution.
Chiba