I recently entered the world of high-end mousing. I have to say, I'm impressed, and wonder how I ever got along without it.
The Razer Pro|Click V1.6 feels good in the hand, is smooth and accurate, the buttons have great action, the software driver has a "sensitivity adjust on the fly" feature that is wonderful, and the thing is just plain cool looking too.
As a frequent purchaser of high end pro-sumer level computer gear I have to wonder aloud "Does high end gear always have to be festooned with bling?" There is a substantial amount of duct tape on my PC case to try to block out the red and blue LED glow. I have dismantled many a component to clip a leg off an LED that is just there for show. I have felt like a complete idiot delivering a high-end server machine that looks like something out of Blade Runner and glows like a UFO to a law office.
Back to the Razer. It glows blue. Brightly. The scroll wheel has a bright blue LED underneath it and the mouse literally illuminates the whole room to the extent that I can read a book with the lights out. The night that I got my new mouse, I laid down in bed and looked up at the new bright blue glowy spot on my ceiling (from the mouse in the next room).
In looking at the features of other Razer mice, I did see one mouse (the DeathAdder -- great name [its a gaming mouse if you couldn't guess]) that had software control over the internal lights, a very nice feature. I wrote to Razer support and they promptly replied that they had no plans to include that feature in this mouse.
It is worth mentioning that Razer makes gaming hardware, and the Pro|Click line seems to be their first foray into making goods for the professional world (that is, the non-gaming professional world), so maybe it was just out of habit that they kept the bling in this model of mouse. To disable the cosmetic LEDs inside your Razer Pro|Click v1.6:
You may notice that now the mouse emanates *no* light at all, since the high resolution sensor uses infrared light which is invisible to the human eye. Yay.