My wife has that case for her S5, she loves it. It actually adds wireless Qi charging as well(it replaces the whole backplate of the phone). Another added perk is that it turns the phone on and off instantly when the cover is opened or closed, no need to hit the power button. The only thing she really uses the screen for is taking pictures, you can use the camera from that little front screen, without having to even open the case. It's actually a pretty cool case, if you are the type of person that uses a case for extra protection, this one is a no-brainer with the extra features that it adds for about $30.
Plus, wireless charging is almost mandatory for the S5 because the micro USB port is covered with a cap that keeps it waterproof, but is a total bitch to open to plug a cord into it.