Razer's second wireless gaming mouse, Orochi, goes Bluetooth and pint-sized. It feels surprisingly great, actually, but the tracking sensor doesn't quite live up to its promise of portability.
Orochi is $80, which is steep for a Bluetooth mouse, even one that travels well. It's especially painful considering the sensor's finickiness means it doesn't live up to its raison d'tre, even if the mouse does feel great for a portable and you get gamery things like onboard storage of macros.
Orochi pulls off that rare trick where it manages to feel almost ergonomic when you grip it, despite being a symmetric mouse, because the side grooves cradle both your thumb and your ring finger. The rubberized texture is classic Razer—smooth but sticky at the same time, designed for your hand to sweat on and still maintain a grip. In the end though, it is a small mouse—so while it works great in a pinch for a couple hours at a time, the squee size makes sure it's not exactly the comfy La-Z-Boy of gaming mice.
For a mouse that you're meant to take anywhere, it should have a less picky sensor. While it tracks perfectly on my wood desk and on regular mousepads, it was pretty damn spotty on the faux leathery surfaces covering the desks at the Gawker offices, though they've never been a problem for other mice I've used on them from Microsoft or Logitech (I always considered them to be nearly perfect mousing surfaces, actually). It's unfortunate, too, because the bottom of the mouse itself glides on top of anything like Brian Boitano.
Orochi uses a pretty standard Razer configurator that lets you adjust DPI, program buttons, assign macros, switch the mouse's lighting on or off. There's even a Mac version now. The catch is that you can't configure the mouse when it's connected via Bluetooth, you have to plug it in via USB. But the Bluetooth pairing process itself is painless, and worked perfectly. I didn't get to fully test Razer's claim of 1-3 months of battery life under "normal usage" for obvious reasons, but I haven't managed to kill it with a couple days of what I'd call heavy usage. If the battery does drop, you can always plug it in via breakaway USB though.
If it was cheaper and the sensor could handle more roughage, it'd be a solid pick for fragging in a Starbucks, but it's a kinda risky buy for that much money, as is.
Ergonomics are solid
No configuring while using Bluetooth
The 4000dpi sensor is a little too picky about surfaces