Top positive review
Replaced a trackball and never looked back...
on April 20, 2013
I use the mouse on a daily basis, and use the buttons to record macros to do repetitive tasks. The size of the mouse took a bit of getting used to, but it's comfortable enough to use, even with my carpal tunnel syndrome. I've yet to use it for its actual purpose (gaming), but it works for a daily work mouse. The only problem I had was with the installation software that requires you to put a program on the machine - but that was less for my issues and more because I had a workplace whose software installation rules looked like a throwback to Orwell's 1984, with an incompetent IT sysadmin whose idea of a hard day was to provide an ergonomic keyboard to someone without filing forms in triplicate. That said, it still worked great for my daily usage.
I also use this with a Logitech G13 keypad when I'm working on graphic-intensive and click-through intensive projects or documents. Spending four hours messing about with the software really helps. The one thing I'll note is that making sure you have an application like AutoHotKey to act as a secondary addon for the mouse and/or G13 keypad helps immensely, especially if you have a series of commands or scripts you want to use with this. Just make sure that you have a clean mapping of what item goes where on the keypad and the mouse, and make sure it's something you can remember easily.
One other note: the thumb buttons (keypad on the left side) of the mouse come with "training" stick-on plastic bumps. They're intended to help train your muscle memory to use the 1-12 buttons, but they do fall off. If you don't want them to do this and don't care overmuch about the appearance of the mouse over the long term, it might be a good idea to use a permanent adhesive, especially if you have only a few buttons that you choose to use routinely. I tend to use the top row (1, 2, 3) and bottom row (10, 11, 12) more than anything else, so my most common keybinds are set to those buttons, with the rarer ones set in the 4-6 and 7-9 range.
I do like the ability to turn off the logo and buttons via the Razer Naga's utility program itself, and the ability to customize a profile loaded when the program I'm running is in the front is helpful as well. It takes a couple of seconds for the mouse to register the settings once you make them, so don't get too impatient just yet if it doesn't automatically dance for you when you make the settings final.
I plan on buying another of these soon, and saving the profiles through Skydrive or Dropbox to keep them available on my work laptop, just to make sure that what I'm used to on one machine flows through on all my machines - so I have an uninterrupted workflow.