Earlier quoted context omitted.
I am typing on one of those right now. I love mine, it is just like the model m, but it has a windows key and USB.
Does it come with a PS2->USB adapter so you can connect it via a PS2 port? Better input handling than USB :)
A common misconception. The USB HID Keyboard Boot Protocol, aka the lowest-common-denominator mode, is very limited and is where this belief comes from. 6KRO + modifiers, limited refresh rate, etc.
This mode is only required for compatibility with certain BIOSes and pre-USB operating systems, though some "gaming" keyboards start in this mode and only switch when they've been twiddled by their driver because a subset of those certain BIOSes won't even boot properly with a keyboard that goes beyond the boot protocol connected.
When booted to a remotely modern OS that has a full featured HID Keyboard driver it can support NKRO, up to 1000Hz refresh rates, etc. and as far as I'm aware is able to match or beat PS/2 in all ways.