Reviews on Amazon.com and LazyTechGuys.com indicate iShieldz screen protectors are effective at guarding smartphone screens from dirt and scratches. IShieldz screen protectors are compatible with various models of iPhones and other smartphones.
Many reviews on Amazon.com indicate that the auto-align feature of iSheildz screen protectors makes them easy to apply. The same reviews note that when applied correctly, the product becomes a clear, bubble-free surface that is almost unnoticeable.
The Lazy Tech Guys review notes that users should clean the screen of the phone thoroughly before installing the iShieldz screen protector. This review also indicates that some air bubbles may persist after installation, but they generally disappear after a few hours.