It's interesting that there are so many different user experiences between the Tempered Glass screen protectors offered by VZW, Extreme Guard, and (now) iVoler. My VZW got the job done, but the fitment was poor (seemed way too small for the phone), and I had a small visual defect on the edge where I had to re-lift and adjust to get a dust bubble out.
This morning, I finally got around to installing the Extreme Guard (1/3 of what I paid for the VZW), which has been very polarizing with many both loving and disliking it. I am in the latter camp here. Fitment was far better than the VZW. Perfect adhesion and positioning on the very first application attempt, and daaaang, that thing is way thicker than the VZW. Make me feel like my phone is practically armored.
The iVoler is so far getting mostly positive comments, so I've put it on my wish list in the event I run into any problems with the Extreme Guard (though I don't expect to). I wonder if the different experiences with all of these products are differences in the products themselves (not all being created equal), user expectation-slash-installation, or a combination of each?