But while it's undeniably more powerful, the Surface Pro makes trade-offs -- most notably, middling battery life, a heavier chassis, and a price tag that starts at $899. That hit on your wallet becomes closer to $1,200 if you go with the 128GB version (a necessity) and add the so-cool-you'll-want-it keyboard cover. And you can say goodbye to the free version of Microsoft Office that came with the Surface RT; Surface Pro buyers will need to spring for that, too.