It's a Razer Naga MMO Gaming Mouse, which I got to replace the Razer Diamondback I got in 2007 for speaking at State of Play 5 in Singapore. The Diamondback is still good, but it only has five buttons: left, right, wheel, thumb, fourth finger. The Naga has left, right, wheel, left front, left back, twelve thumbs. I put a training sticker on the 5 but I might take it off as I keep pressing the 5 as well as the 2 when I aim for the 2. I can't get the 3 very well because of the way my thumb sweeps. I can get 10, 11 and 12 but if I use the 1 and 2 a lot (and I do) I have the mouse a bit further forward and it's a stretch.
I'm actually a little disappointed with it. The thumb buttons are pre-programmed either to mean the number line at the top of the keyboard or the numeric keypad, with a manual switch deciding which is which. I was under the impression that they were fully programmable, so I could fix them up such that if I hit the 1 button, say, it would send a left-mouse click followed by a keyboard 1 key. My keyboard is programmable, but unsurprisingly doesn't include (nor capture) mouse clicks.
I wonder how long it will take before it gets gunked up from too much use? Cleaning it doesn't look as if it's going to be easy...