Nice score, the 2007 MacBooks are still a great machine, especially in black. I did a Blackbook conversion on my Late 2007 nearly 12 months ago and I haven't looked back.

For what its worth, since its a Mid 2007, if he has reinstalled it using the original installation discs, it'll have Tiger on it - Leopard didn't start shipping on the MacBooks until the Late 2007 MacBook came out.