Two words to describe this drama: action and Kimura Takuya. The first one is all along the 10 episodes. The second one is the main reason you should watch this drama. He is an amazing actor, as a scientific geek in love and as a robot.
The story was interesting, overall the first episodes... and sad too. It's true that sometimes in the middle it gets kind of boring... but it has some funny twists, as at the end.
The acting, as I said before, was perfect. Kimura Takuya, as in Pride, can make you feel all the possible emotions through his eyes, without even a word. Shibasaki You was better that in Nobunaga Concerto, but not as good as Takuya of course.
Music: it was nice, in English, but it puts you in the mood in the right moment.
Rewatch value: perhaps the last moments of the first and last episode, to see Kimura Takuya as Matsushima Reiji.
If you want to watch this amazing actor and a lot of action, watch it!