Surface Pro 2
I too strongly considered the Surface Pro, and the SP2, for my mobile computing needs. And as you said, it really is all about how you're going to use it. My issue is that it's really almost too much computer for a 10" tablet form factor, and usability suffers for this. In other words, I found it too bulky, heavy, and the screen was simply too small to be able to actually use that power to be productive.
When I'd sit down to type either at a desk or on the couch, it was rather difficult to do so for any length of time, while remaining comfortable. I'd just end up using it as a tablet only. In which case, it was just a little too heavy and bulky for extended use. And I wasn't even remotely using the power of the i-core CPU like this. Which seemed like a waste of such an expensive device.
So I thought I'd try games. I quickly found that it was either wasn't powerful enough for the games I wanted to play and/or the screen was too small.
Basically, I just couldn't find a good use case scenario where it made sense to spend that kind of money on the SP1 or SP2. For me, a larger Ultrabook or a more traditional tablet made more sense. Combining the two just didn't work.
Galaxy Note Pro 12.2
I of course haven't used the Note Pro tablet, but from what I've seen it looks like it might actually work for my needs. I know it's expensive "for an android tablet." But for a 12.2" portable computing device, it's almost a bargain. Well, maybe not a "bargain," and there isn't exactly any real competition for it; at least until others jump on board.
First, it's still relatively light weight for it's size. Find me another 12" device running around 1.6 lb, let alone at this price point. Add that to expected tablet-like battery life, portability, nice screen, new launcher, top-end tablet specs, and I think it looks very promising. Well, at least on paper. I'll have to judge that for myself when I get it. If the software and hardware fail, I probably will have to revisit the ultrabook idea. I just didn't want to spend that kind of money right now.
And the most important part is what I'm going to use it for. No, I'm not going to write a book on it. Not expecting to play BF4 or SC2. Don't need it to fit in a pocket. I've got a 5.7" phone, high-end multi-monitor workstation, and 15" notebook for those tasks. I just want something relatively portable to use when traveling, in a vehicle, in a plane, use at work, or even on the couch. If I'm leaving the house with it, just like a 10" tablet, it's going in a bag on it's own, or with my notebook and it's larger bag.
Then it needs to play videos, music, surf the web, and even handle the occasional high-end android game. I'll probably give some light on-the-go productivity a try on it. But like I said, a notebook with a real keyboard is always going to make far more sense.
Mine gets here Friday. Still hoping it works out!