This is an absolutely terrific keyboard, best I have ever had. I "downgraded" from the twice-as-expensive Dinovo Edge; this keyboard eliminates some of the relatively useless frills on the Edge, and adds a numerical keypad, the absence of which is one of the Edge's big negatives. It is every bit as elegant. The "feel" is great. I have bought hundreds of products from Amazon over many years, and this is the first time I have been moved to offer a review.
I have no idea why Logitech refers to this as a "keyboard for notebooks" (which is why I didn't pay it any attention when I purchased the Edge a while back). The key size and spacing are identical to the Edge, and in fact the keyboard is actually wider than the Edge by an inch or so, thanks to the numerical keypad. It IS about an inch and a half less in depth, but really looks and acts like a full size keyboard.
It is true, as noted by other reviewers, that with the default settings, pressing a key on the numerical keypad will result in a big green screen display of "Numlock On," followed immediately by "Numlock Off." This is annoying, but can easily be eliminated by going to Setpoint Mouse & Keyboard Settings > Tools > Software Access, and un-checking the box "Show status setting changes on screen" - there is certainly no need to uninstall the Setpoint software, which is really quite handy for a variety of purposes, including assessing battery status, and assigning Hot Key and F Key functions.
I have had no problems with delay, as noted by one reviewer, and I suspect the delays he experienced in "chat windows" simply reflected the fact that the characters appear on the screen only after being reflected back across the Internet - the delay is likely there, not in the keyboard.