I bought this because the glass had cracked on the exterior display of my Razr V3 in normal use.  I'm not particularly rough with the phone and am not sure how it happened, but I replaced the glass and bought this protector hoping to avoid breaking it again.  No problems since.  I was also very impressed with how easy it was to apply.  I'm a veteran of many PDA stick-on screen protectors and have found them to be generally difficult to align properly and apply without bubbles appearing between the protector and the screen surface.  The adhesive on this thing is very forgiving during application but has stayed put.  Good job overall.