I have to add my voice...the Zagg Glass is simply AWESOME. I had the Bodyguardz Pure on my iPhone 5S since release day...the glass developed a bubble on the screen over the last week and I contacted Bodyguardz (no drops, no "trauma"). They directed me to their "Advantage Program", which cost $12.95 to replace a Pure. That's what I signed up for...no problems there. I ordered my replacement and plan on selling that on Ebay after getting the Zagg Glass.
I figured this was my chance to try out the Zagg Glass. InvisibleShield HD's have been my staple for all other iOS devices and their warranty is second to none. The Zagg is thinner than the pure, smoother to the touch and the rounded edges and around the home button really makes the Zagg feel like it's not even there. The Pure is great (it protects my iPad Air screen), but the edges are...well...edgy. Not so with the Zagg Glass. The Pure is .4 mm thick. Not sure what the Glass purports to be, but it feels thinner and overall more like the original glass.
If you're looking for a tempered glass protector, Zagg is it. Their warranty (free replacements for life) is just second to none.