It's really late and has 2 advantages:
- Does not increase too much the size of the phone (many people have not seen on my phone)
- 0.3mm thickness keeps it compatible with a number of lightning connectors (eg dock Brandt BDS-795L), but not against with others (eg Adapter Apple Lightning to 30-pin, or Dock Sony ICF-DS15PSN)
The only real downside is the opening at the lens and flash: cutting could have been more precise ... and air cut crooked.