Microsoft's Surface has captured all the buzz among Windows RT tablets, but ASUS hopes to steal the spotlight with the $599 Vivo Tab RT. Both devices have the same quad-core Nvidia Tegra processor, 2GB of RAM and 32GB of solid state storage, and both have Microsoft Office preloaded to give you more productivity punch than the iPad out of the box. But the Vivo Tab RT comes with a keyboard that promises to double this slate's battery life, while the Surface's slim Touch Cover keyboard doesn't add any juice. And that's not the only difference. Is the Vivo Tab the RT tablet to get?