The outside part of the case provides the strength. This won't be slipping out of your hands anytime soon but you might fall foul of this case's only drawback..
The middle part of the case is an ingenious fold out stand which provides a locking mechanism so it won't be falling over which makes it excellent for watching video/YouTube either way you lie it, which is great.
Unfortunately, when this stand is closed, and the phone is lying on it's back, then this small middle section acts like a see saw when you're trying to use the phone lying on it's back.
It's a small drawback, when you have it on the desk, just leave it using the excellent stand.
You also might think the phone will be too big to get into your pockets when the case is applied but, surprisingly, the case does not add too much bulk to the overall size.
In summary, if you spent a lot on your phone then you'll want to protect it, if you buy this case then you're phone will be protected, partner it with a good quality tempered glass screen protector for the front and you can feel assured knowing your phone is safe and protected.