Awesome Arduino board at an extremely low price (I bought it when it was on sale).
Works very well, fits nicely on a breadboard and the built in USB interface is very nice to have on such a small board. My only small complaint would be on the USB cable that the unit shipped with. It is very stiff and unbendable, not well suited for connecting such a small and light board to the PC. It's just a standard micro-USB cable though so you can use any other if you like.