I have used most of Microsoft's keyboards. With a typing speed of 180wpm (Mavis Beacon) and a computer related job - keyboards are my life.
I got this new keyboard with my new Dell system at work last week. At first I thought these keyboards would be pretty crappy because of their $14 price tag. The first thing you notice when you type on these keyboards is how quiet they sound... Well, that goes away with a few hours of use (for me anyways). After a few days of use the keys really loosen up and become pretty loud so if you are looking for a quiet keyboard, this isn't it. However, the smoothness of the keys allows for some pretty fast typing. I bought one for home and have been using this keyboard as my main keyboard for a few days because I liked it so much. It is pretty compact, doesn't require any drivers for the special keys to work, I like the build and ease of key presses.
I'm surprised how long and how fast I can type without the "wearing" out feel I got with other normal keyboards. This keyboard will remain my "main" keyboard for many months at work and at home.
Compared to the Microsoft Comfort Curve 2000 - this keyboard is much more quiet and takes much less desk space. There is also more keypress length (whereas the Comfort Curve 2000 has a notebook feel). This keyboard is significantly lighter as well but it has well built/placed rubber grips so it does not slide on the desk no matter how hard/fast you type.
I'd definitely recommend this keyboard for anyone looking for a well built cheap keyboard.