CM Quickfire TK (MX Brown) here. Good keyboard. It's a bit smaller than a full size keyboard, and, no complains. I thought the wire, which is just a micro USB port, and held by the cable channels, would be an issue, but it hasn't been so far. Nice and compact, fairly heavy, and takes less space than my older full size QPad MK-85. Not very expensive either (think I paid £65?). Also has a full numpad, 'numlock' switches between numpad mode and utility keys. No software, just plug it and use it like a regular keyboard, which I like.
The Rapid-I is similar, but does away with the numpad functionality.