I don't think there is actually any metal, though...just plasic..and maybe an exposed wire somewhere :P

First time i tried the mouse, i thought it was super sensitive, and not in the dpi sense.
It was much lighter than the G9 weighed down to the max that i switched from (and subsequently back to) and i would end up hitting the buttons on the "d-pad" when i tried to move the mouse. After an hour or so, you do get used to the new weight and where to not stick your thumb.
The d-pad is actually pretty convenient for gaming macros. The rest of the buttons are a little of an uncomfortable reach for me.
The backlight color is nice especially since you can set it to any color (except black), though some of them you can barely tell apart.
Between the G13 and the mouse, however, you don't need a keyboard which is a big plus for it.