Almost everyone I see with an iPhone has a case on their iPhone. With the Diamond Dog screen protector, there is just enough space to support the use of cases.
Alignment was perfect, there were no bubbles and the display is completely protected. My fingers slide easily around the glass and it has a great coating to reduce fingerprints.
The clarity of the display was also not compromised in any way, so that the beautiful display of the iPhone is preserved. I never dropped my iPhone on the display to test its resistance to damage. Diamond Dog says the protectors have been lab tested to be 3-6 times better against scratches, 5 times better against abrasion, and 3 times better against bumps than leading competitive screen protectors.