I have a cheap 7 for like £3 screen protector kit, tried two out to apply the screen protector correctly, then the third i properly put on and i peeled the bottom right corner just so i can easily take it off (its not noticable either!)

I've been very happy with the quality of the screen protectors, and there doing there job dam well!

No scratches on the n900 screen yet! and no real loss of response either,