Must say that I cant really complain as I got this for free with hy HTC so in terms of my own value there is no problem.
However as most have stated the main issue with this cover is that it very quickly becomes loose. Almost everytime I take it out of my pocket I have to refit one of the corners.
Also the buttons are not very tactile with the cover on, you need to know where they are or poke around a bit to find them which can be a bit annoying.
The screen protector though is good. Keeps the screen in good condition and doesnt restrict the touch responsiveness or anything. Just make sure that your screen is completely dust free before you apply it else it really shows up and you wont be able to remove it from the adhesive.