I did not think that the tablet would be able to replace a laptop for "serious" work, but it did. There are a couple of things that allowed me to do this. First, a USB port having the ability to hook it up to "stuff" comes in handy. Second, snapping apps side by side. And, the ability to use the desktop. I could have Excel and a browser window open at the same time. Third, I could access all of Google's apps through Internet Explorer.
I was able to create great decks on Powerpoint, manage large Excel files, use the Google Suite, and multitask like on a laptop. The Surface RT was my main machine for the entire summer. And, at home my lady still used it to watch netflix and surf the web in bed.
In August instead of replacing my Macbook with another Mabook, I purchased a Surface Pro. I run Adobe CC, Ableton Live, Microsoft Office on it everyday. It is my all one in solution.
Windows 8 has a learning curve. It took me about two weeks to fully understand the OS, but I came from an Mac OS background. I recently started working in a digital agency, and we use Windows 7. I have to say Windows 8 makes my workflow easier than 7.
Edit: I forgot to mention the pen! This is one piece of technology that makes me giddy. It works great with OneNote and Photoshop. I grew up with plenty of PDAs with stylus input. But, none of those lived up to the promise of an actual digital pen. Most filled the need to tap small boxes and areas on the screen. The stylus on the Surface Pro makes it feel like a different device when I am in a meeting taking notes. It stops feeling like a laptop or "tablet" and more like a digital notebook.