I used a ThinkPad T400 for about a year and a half before getting a Macbook Pro. The ThinkPad is junk compared to the MBP. Sadly, it's still one of the best Windows business laptops you can get.
I've had exactly the opposite experience. I've owned 3 thinkpads, 4 macbook pros (between my wife and i), and an ibook. The thinkpads are tanks that take any beating i give them and keep running. The ibook was solid. The macbook pros have been complete crap--breaking dvd drives, failing harddrives, failing keyboards, cracked displays, failing trackpads. On the dvd drives, Apple has refused to admit the problem, and has repeated deleted forums with people discussing it. They've completely lost me as a customer.
The t400 is a tank. It survived university and being dropped more than a few times, and beer spilled all over it. MBPs are like Maserati/BMW/whatever which are sexy but require much more maintenance and care than the Honda civic of laptops aka the thinkpad T-series.
