I just put a screen protector on mine yesterday (I use a stylus so I didn't want to risk scratching it.) and it seems to be working just like it did before. I haven't noticed any difference in the reponsiveness of the device. The screen protector I have I bought at walmart and I think it was supposed to fit the kindle so they were too small so I ended up using both of them to cover the screen. I will be investing in a screen protector that will fit better, soon. Also the ones I have on there now are matte finished and I like it better than the glossy screen, but thats just my preference.