Brighter-Screen 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.
I recommend you use Brighter-Screen Lite if you don't have a big-screen Mac and don't use your Mac for watching movie often.
Maximum brightness 105%
Minimum brightness 10%
Movie mode (same as photoshop shadow effect and useful when you watching high quality movie on fullscreen)
Tip 1. Default short keys
More F2 (or Fn + F2)
Less F1 (or Fn + F1)(These are 2 times faster than apple's buttons.)
Tip 2. Sleep Display
Display sleeps below 10% brightness level to save energy automatically.
I wonder what increasing the screen brightness above Apple's limits will do too the screen life or the monitor's warranty. Given the price of an Apple Monitor I would not be willing to take a chance on using this app unless I knew the answers for sure.