After reading the many reviews and going to a local shop to see it, i think this is fantastic. Not just for gaming, but most importantly, it has 22 programable keys. The greatness of the programable keys isn't just from the company's spin-doctors, but highly liked from user reviews. The software is actually quite good, and comes with a programing language using Lua. So, if you are a emacs user with its 3 thousand commands, and or 3D modeler, Second Life player, this extra keypad will be extremely useful.
There are many gaming keyboard out there. see Gaming Keyboards for Programers (Emacs, Linux, Blender, …)
They all have many programable buttons and keys and some have displays and knobs. I LOVE these extra buttons and knobs.
However, they all have one major usability problem: They are not ergonomic. So, if you type few hours a day, chat in games, or writing blogs or emails, these keyboard are pretty unusable.
A optimal setup is to get one of those high quality ergonomic keyboard, then, get a programable keypad such as the G13.