I'm a gamer and build my own systems over the years. Lets be clear what I consider performance.
- Smooth movement (is it jumpy or does it smoothly move the icon or view in game)
- Comfort of mouse (does it feel good to my hand so my hand won't hurt later)
- Buttons (Are they quality? Do they depress easily? Are they located in the right spots?)
- Software (Does the software allow me set sensitivity and map keys?)
Mapping out how fast a click response rate is stupid. Of course there won't be little difference.
The purpose of getting a more expensive mouse are the additional features. If anyone purchases a mouse because "it's response rate is faster than an average mouse" is just stupid. I have a Razer mouse and it vastly exceeds in my performance criteria than the standard Microsoft Intellimouse.
I've tried about 20 different mice while gaming and coding and non perform for me as well as the $70 Razer I have. Is it right for everyone? no. But their study is flawed.