Is the cheapest 15″ Macbook Pro a good buy?

Really want to buy a macbook but the cheapest 15" they do is £1,299 with a processor of 2.53GHz. Is this any good its slower than my current Sony Vaio AR but does it make up for it in other ways.
thats kind of what i was getting at does the mac os run better needing less power

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Tags: 15, Mac, MacBook