OCC has published a review on the Logitech G19 Keyboard for Gaming

Obviously the G19 keyboard is very customizable. The keyboard has 12 macro keys, an LCD screen that can be set to display a wealth of information, and a backlight that can display most any color, although some colors display better than others. Additionally, the ability to change between three profiles at the touch of a button is key. If you have several games you switch between, you can make three separate profiles, complete with different backlight colors, to handle all your custom key macros.

Logitech G19 Keyboard for Gaming Review