I think this is a move that Hamilton felt he had to make. Good for him - I don't really like him or the Mercedes team, but can certainly recognise that he's a fantastically quick driver on his day, and Brawn has championship experience and pedigree. I don't believe Hamilton can galvanise a team around him though - certainly not in car setup and motivation. They're not exactly crying at McLaren - disappointed, yes. Upset, no.
I'm not so interested in the Lewis and Nicole, and what happens to the whole bling display over at Mercedes. I'm more interested in the positive story developing over at McLaren. I think this is a great move for Perez. He's joining one of the top teams, and in Button he has a driver that he can both compete with and also learn a good deal from. I can see the next couple of years being a fantastic grounding and education for him in what could be a really promising F1 career. He's shown enough to suggest he can be as quick or quicker than Button, and he's clearly got some racecraft and nouse about him.
Suddenly 2012 doesn't seem as exciting as 2013 could be!