Got some last final questions about the Zagg invisible Shield. 1. Will the screen protector reduce the brightness? 2. Does your finger slide smoothly across the Invisible Shield? 3. Is the front piece and the back piece the same thing?(Wondering because if it is the excact same then maybe I could use 2 fronts for the whole body, since nearby store only sells screen protector.) If you can answer any of these questions it will be greatly appreciated.