I have the Spigen Glastr installed on my Galaxy S4 and LOVE it. As someone else said, it is the best protector that I have used (and I have used just about everything from Zagg and Spigen). This doesn't affect any of the sensors and was very easy to install.
One tip to help with the installation: place some masking tape on one of the long sides of the protector and position the cover with the plastic still on the protector. When you have the screen protector positioned, tape one side of the cover in place and remove the plastic from the back of the protector. Press the protector into place. Remove the masking tape and the plastic from the top of the screen protector and you're in business!