I purchased my G15 today.

They keys are really comfortable to type with.
The included SDK is hidden away in the GamePanel Software directory (I was searching for it on the CD). The SDK is really easy to use. You basically register a window with the keyboard (since from the LCD controls you can switch between what program to be currently active on the screen (view resources, IMs, e-mails, etc), then at the lowest level you're exposed to a frame buffer. Wrapped on to of the frame buffer you can optionally use the included widgets (animated bitmaps, progress bars, scrolling text, etc). Then wrapped further on top of that is a basic widget manager that offers less flexibility (you can't change font) but it's only a few lines of code to get the LCD display up and running.
There are four buttons underneath the LCD screen that are reserved for LCD programs too.
It's really cool
