It improves brightness control more than Apple's way.
Traditionally, the iMac product line have a dark gamma value less than windows or TV. This application can adjust brightness easily dim or bright.
*Note that It doesn't use hardware backlight or LED.
1. Maximum brightness 103%
2. Minimum brightness 10%
3. More and Less brightness short keys.
4. Multi-monitor support.
5. Same look and feel apple's UI.
Tip 1. Default short keys
More F2 (or Fn + F2)
Less F1 (or Fn + F1)
(These are 2 times faster than apple's buttons.)