The Razer does not default to anything but the standard, accelerated curve, at least from my experience across 10.6-10.8. It is the Deathadder 3500.
Many mice introduce acceleration at a hardware level. Laser mice have something in the range of 5–10% acceleration at a sensor-level that cannot be disabled no matter what you do. Other mice have acceleration at a hardware level by default that
can be disabled, but requires their drivers to be installed. (this is fairly uncommon now)
By default, the DeathAdder has no acceleration at a hardware level.
This has no impact on whether there is acceleration in the OS at a software level, but it means that as soon as you disable the OS-level acceleration, you have accurate control.
On Windows, this is as easy as going to the standard mouse control panel, unchecking the "enhance pointer precision" pointer option, and making sure that the pointer speed is set in the middle (default) position.
On OS X, Apple doesn't offer this control to the user, but there are several utilities that can disable the OS-level acceleration without the need for specific mouse drivers to be installed.
The DeathAdder also polls at 500Hz by default unlike a lot of mice which poll at 125Hz by default, and need drivers installed to set higher rates.
There's really no need to install the drivers for the DeathAdder, so their quality on OS X really doesn't matter.
This is also the mouse I use. But the OEM feet are TERRIBLE compared to Teflon feet. So
replace them.
Good advice. Logitech's feet are very poor in my experience, and I've actually found them to wear out pretty quickly.