MacBook Pro 15-inch 2.53GHz  full review
The MacBook Pro 2.53GHz shares an identical design to the 2.4GHz model, and – as with that laptop – you could be forgiven for thinking little has changed from the old MacBook Pro. You'd be wrong though, this is a radically new laptop.
The new MacBook Pro 2.53GHz has completely rethought with a new physicial case, remodlled design and reengineered innards.This isn't just a new MacBook, it's a new type of laptop.
While all the previous Macbook Pros felt rock solid, the new models seem even more so due to the brand new manufacturing process introduced with this generation of MacBooks and MacBook Pros. Instead of assembling the laptops piecemeal and expertly splicing the components together, the new models sport a unibody architecture that constructs the entire machine out of a single piece of recyclable aluminum. Such assembly, according to Apple, eliminates the need for fine-tuning parts and diminishes the possibility of construction failures. With the new MacBook Pro in hand, it feels almost like an extension of your arm. There’s no clasp keeping the lid shut: simply grip the thumbscoop etched into the bottom of the case, and it opens right up. Even without a clasp, it feels secure when closed.
The unibody composition also makes these new laptops easier to service and fix, and great for do-it-yourself types who have, in the past, lamented how difficult it was to do things like swap out the hard drive or battery. The new MacBook Pro makes it very easy to access the battery and hard drive—move the lever on the bottom of the case, and you’re in. Upgrading RAM requires the removal of eight screws; the previous MacBook Pro had only three screws.