I had a viper which worked wonderfully with the standard mouse driver. I gave that to my dad (soon after which my mom's fluff ball of a dog ate it), and he purchased a copperhead for me.
I have yet to get the Copperhead to work. When I plugged it in, OSX thought it was a keyboard. When I installed the USB Overdrive driver (which I didn't need for the Viper), it didn't pick up the mouse. Looking in the Hardware Profiler showed a Razer Copperhead mouse though. Go figure.
I updated the mouse on my dad's Windows laptop the following week when he came to visit (yes, the Copperhead has firmware, and no, you can update it on anything but Windows).
After updating the firmware I plugged in back into my Powerbook (which had just had a fresh erase and install of OSX mind you) and again the new keyboard menu popped up. However, the cursor would actually move now and I could use the and right buttons. Unfortunately the cursor movement was too slow to be useful and no toying with settings changed that at all. USB Overdrive driver was tried again, but it still did not pick up the mouse.
I sent an email informing Razer of this (actually a few emails were involved) saying that if they didn't know if the mouse worked on a mac, they should state that on the product description as opposed to just linking to the USB Overdrive driver. I said if they felt the mouse should work in OSX, then to please replace mine (I'd prefer to keep using Razer as opposed to switching to Logitech) otherwise I'd need a refund.
I'm mailing the Copperhead back today, so I imagine next week I'll see if there's any change in this status. I have yet to read of an account of a Copperhead working on OSX, but then again, I'd expect to see more problem posts than "Hey, it works." posts.
Yeah I sent them an email about this last week. I don't own one, I was just curious after reading reports. They replied this:
"Currently, we do not supply Macintosh drivers for the Razer Mice. If you would like to use the Razer mouse with your Macintosh, you can download the USB Overdrive drivers from
www.usboverdrive.com, which will allow the mouse to work.
NOTE: These are 3rd-party drivers, and we do not support the Razer mice on Macintosh. You can use the mouse on a Macintosh using these USB Overdrive drivers, but you will not be able to program the buttons."
And I know that they must know about the problems with the Copperhead and USB Overdrive.
And they also say that they don't have mac drivers for their mice, but that's also not true. The Razor Pro 1.6 has a mac driver. I'm awaiting reports (thanks sladuuch) about the functionality of this mouse and driver, because I want one despite the customer support!