I've had ZAGGs on *all* my products they make them for, and I *DON'T* like them (anymore). I just haven't switched b/c the lifetime warranty made it dumb to switch and pay a penalty. I have since found the other products to be so superior in feel & look (and preserving the "pop" of the display) that the few bucks I save with their "warranty" (i'm sorry, read: shield replacement at only a 100% markup - USPS FCM to ship a new shield whose landed cost to the US was $.25/unit to begin with *at best* isn't $3.99).
What they call a "warranty" I call a heavily discounted replacement program to a highly, highly marked up product...don't get sucked in with the misleading terminology.
They (I feel) had an early product & model lead (e.g. great protection+ unlimited replacements on a 200x marked up product business model = awesome). Since then, others' technology has gotten better, or at least widened to include more than just one phone model/size. I feel like the other vendors are now slinging appreciably better product at the same price point, so $20 for a shield I like that doesn't look horrible and kills the screen quality (I am always amazed how good the Retina display looks sans shield when I'm changing it, then sucks again when I put the new one on) is a much better deal than a cheap shield I can get new ones of when it beings to fail.
I'll switch away from the ZAGGs because the orange peel ruins the display quality and feels horrible. I really liked the Power Support product I played with. A lot. And I think one PS shield will last longer than 2-3 ZAGGs. Just my anecdotal experience.
I really, really do not like the look and feel of the ZAGG shield after experiencing the other products. So, unless the other defenders of ZAGG shields can say they've actually tried a few other products and *STILL* prefer it/think the unlimited replacements ('cause you'll need it!) are a good value, I would take it with a grain of salt. Of course, I didn't know there *was* better until I went out and tried it...my head was in the sand as I kept paying $4/replacement for shipping and handling. Knowing that a few times ago would be $12 towards a product I like more that only costs $20 (and probably don't need to replace all the time).