I think it is the shape and size of the Razers that messes with people. The mice are long and low, which is just the opposite of most other mice. The shape allows you to control movement using just your fingertips and wrist.
While it takes a day or three to become accustomed to a Razer, once you do you won't be able to stand using a different kind of mouse. It's hard to believe the difference that it makes, but it does make a big one.