It broke very easy the, less than 1 week after putting it on. I rarely drop my phone, but it fell one time off of my desk at work and the screen protector cracked completely. Thankfully my phone screen is ok.
Almost invisible if installed properly. Make sure the screen is COMPLETELY clean. I put the protector on my brand new phone directly after removing the protective plastic, and still got some dust underneath...that the only possible downside. The bubbles initially trapped will disappear, unless there's dust under the protector.