Better off with a Windows Phone
...at least that's what I think.
I mean, when looking at the comparison chart for the Surface RT and the Pro you'll notice quite a bit of differences, and I'm not only referring to the difference in price ($499 for RT vs. $899 for Pro).
For example; at least the RT comes with a Home edition of Office. Sure; its a stripped down Office since you won't be able to get Outlook functionality, but its still Office. The Pro version doesn't include such a thing, even though the price sits quite higher.
Also note how on that same comparison page they're actually trying to sell features which have nothing to do with the Surface itself but fully come from the underlying OS. I'm talking about stuff such as "security policy control" and "enhanced data protection capabilities using BitLocker technology". That's Windows 8 talking, not Surface.
And when you finally check the specific hardware features you'll notice the Pro does a lot less. "Always connected" (RT) vs. "Connectivity off when hibernating/sleeping to preserve battery.". Or "Get more done with up to 8 hours of battery life. Surface with Windows RT comes installed with Microsoft Office Home and Student 2013 RT Preview. 1" (RT) vs. (this is no joke:) "Surface with Windows 8 Pro supports the full Office experience. Run Outlook, Word, SharePoint Designer, PowerPoint and more. 2". Where the 1 points to a statement telling us that the full Office 2013 version will become available when its out and the 2 points to "Office products sold separately".
But like; why compare running time with the mentioning that Office products can run on it? Why not, for example, mention that it might have Agenda, Todo and e-mail functionality even when you don't have Office? And why not mention anything about battery life, is it really that bad?
The RT is neither tablet nor laptop, and out of the box not suited for business use even though it comes with Office. And the Pro may support regular software but in fact seems to provide even less functionality than the RT does (that is; unless you're willing to pay even more).
And for the price of one Surface Pro (or RT with keyboard) you can get yourself both a regular laptop and tablet at the same time; so always have the option to pick the best solution for the situation.
I'm not a believer here...