This is my first ever glass screen protector, I've been a die-hard TPU fan since they came to market (i.e. the original ZAGG flexible protectors.) and after installing and scratch testing these I'm sold. For the reviews that say it was hard to install and had lots of bubbles...I think they are accidentally reviewing the wrong product. This was literally the easiest screen protector install I've ever done.After a proper cleaning (*more on that in a moment,) I removed the backer and lined up one edge of the glass with the edge of the z50's screen using my thumb and forefinger and dropped the opposite edge. The glass lie down on the screen and adhered itself with zero rubbing, no bubbling, no squeegie needed. It was slightly off center and I panicked but it easily lifted back up and after readjusting I dropped it into place again, just as easy as the first time. It is *very* slightly wider than that screen (maybe .8mm wider) so it's easy to get a fingernail under it when the time comes around for replacement.Now for a note about what comes in the package (and what to toss immediately)There are blue 'dust absorber' stickers and edge guide stickers in the box. Toss them. They are supposedly intended for removing dust from the screen (dust absorber) and creating a tab on the protector to help keep the edge aligned during install, but the adhesive is cheap and will leave a sticky residue that you'll have to clean off with alcohol. Just use the also included wet/dry wipes like they do in the video on this page and you'll have a dust free surface.The lady bug hotshoe cover is fun if you use hotshoe covers. Considering camera shops sell a single glass protector for z50's for 20 bucks these are a steal, even if you end up damaging one during install, which I really don't know how that could happen....it's so easy...