Small is the new big! I picked up a Game Boy Micro last week. It's the coolest Nintendo handheld yet! The screen is so vibrant and so well backlit that it is playable in nearly any light conditions. This thing is going to be the hot item on many kids Christmas lists so far this year.
So far I have only one minor complaint. My hands are a bit large and there is a natural place for me to put my fingers on the shoulder buttons. When I push those buttons they depress and make a sound, but they don't actually do anything. You need to have your fingers over the middle of the button for it to actually depress. It's a little more awkward for me. Besides that I love it!