Very happy that you have a protector that works for you. Unfortunately, the reviews for the Zagg on Amazon are horrible. Could it really be the case that these poor reviews are all b/c they didn't find the one skilled/knowledgeable installer in their zip code to do an install that know one else can understand or do? Maybe/maybe not. Seems like a bit of a stretch to me. But still, you got a protector you like, and that's a good thing.
This situation is just like the folks that buy the expensive N8 glass protector, which also has terrible reviews, and those owners say that it's b/c there are very special installation techniques that apparently few people can do. However that process really is more complicated than simply pushing a protector onto the screen, so it may be the case with that product. Who knows?
Bottom line: there doesn't seem to be a great glass protector that's affordable and one that can be reliably installed successfully by most buyers. Not yet anyway.