There are way too many variables to consider (what you are using it for, what you need, your price range, blah blah blah). I have used the macbook pro lightly and it looks like a great machine. however, i am always wary of Revision A models. That being said, I just bought a 1.67ghz powerbook from another member on this website and I must say, I am thoroughly impressed with it.
The key is just to be satisfied - there will always be a newer model out there, but is it worth it to spend a few hundred every time something new comes out? for you, maybe, (and that's fine) but for me, no. I have been using a 600mhz ibook for 4 years. other people have been using their laptops longer. others upgrade every new generation. if you have money in your budget and you get a smoking deal on a mbp, maybe go for it.