Not sure what that guy was complaining about but I love my Razer Blackwidow ultimate (2013) keyboard. I grew up on heavy n-key-rollover IBM keyboards and then had to make due with horrible light, cheap, keyboards for many years until I found the Razer. It's worth the price for me. And I've gone through probably 30 or 40 keyboards over the last 35 years.
* Heavy, it doesn't move around.
* USB extension port on the right hand side is perfect for my wireless mouse's transceiver plug.
* N-key rollover that actually works, solid tactile (mechanical) response. I can type at 80+ WPM again.
* And doesn't have thousands of useless extra buttons.
Since a Razer engineer is listening. My suggestions:
* Have a usb port on the left side as well as the right side.
* Change the middle-bottom symbol. I don't quite remember... it might have been backlit before and I took the keyboard apart to disconnect it. It was a distraction.
* Don't reverse the upper and lower-case symbols on the keycaps. That was kinda silly.
* The bottom feet could be a little more robust.
In terms of mice, I use a simple microsoft or logitech wireless mouse now. Simple three button w/wheel... I don't like extra buttons or left/right buttons and when I play games I tend to map most features to the left-hand side of the keyboard rather than to a complex mouse. That way I can bang the mouse around without accidental button pushes. I prefer wired mice but for the last few years I couldn't find any at the stores I frequent.
The wireless mice are fine as long as (A) the tranceiver is within a few inches of the mouse, which it is hanging off the keyboard's RHS usb port. and (B) You use a AA alkaline (non rechargeable) battery. Rechargeable batteries just don't last due to charge leakage. And of course keep a spare battery within reach or replace every month whether or not it needs replacing.