I think it depends your use for that product. Based on the reviews I have heard it seems more promising than before. Sure you can get a faster machine with more space etc. But if you do not need it and want light, portable, and newest tech then maybe this is the machine for you.
Personally I am waiting until they come into an Apple store so I can play with it. If its great Im going to get one, if not MB or see what MBP has released by then.