Hard slippery Case

The Case looks beautiful clear. But it's hard as Plexiglas. Can it really protect my Galaxy S5 in a fall or is there the fall unabated? Especially at the edges of the case has gaps. Allegedly, so you can remove it again. And that's the second problem. It's really difficult to remove the case without the S5 damaging or bend. And the third problem: From any position when the phone once obliquely inspired somewhere, it slides down. And ultimately, the case does just too thick to - both on the S5 and in advertising.