Works great, went on perfect but then again I use a certain "dummy" proof method of placing 3-4 strips of scotch tape on the side of phone then placing protector on screen (perfectly) and wrapping the scotch tape around side to front of protector, clean everything up, peel off backing and lay down protector... Always a perfect fit.  Is it strong? Don't know, don't plan to drop the expensive device to find out....