I put the Steinheil through the durability test, having it on my Incredible for over a year. It installed and fit great. Didn't affect clarity or sensitivity one bit, and it was as smooth (no finger drag) as the glass screen. All-in-all, a great purchase. My one gripe is that it accumulated fine scratches over time which suggests to me that in the long term, it might be good to eventually replace with a fresh protector. Can't complain because it did the job. My phone is immaculate. What I'm wondering is whether or not there's a self-healing material that's NOT a wet application (hate having to spray solution). As for the Zaggs, I find my buddy's iphone protector to feel rubbery and more difficult to swype my finger across. I may just pick up another set of Steinheils for my Charge.