I don't know how to totally articulate how I feel about it. I consider it more of a laptop-first, then a tablet. The weight is definitely not ideal. I'm coming from an iPad (original edition), which I then sold for an iPad Mini, so the size difference is definitely substantial. While I frequently read books on my Mini, I don't think its very realistic to do frequent reading on the SP2. Maybe that's in my head, but it's just too big. Not only heavy, but also just big. I felt the same way about the original iPad, FWIW.
In bed I used to use my Lenovo x220 for surfing the net instead of any tablet. I enjoyed the form factor quite a bit, and the fact that the screen could bend all the way back even up to 180 degrees made it very easy to find a comfortable position to both surf and type. Considering when I'm on my personal computer, I'm almost entirely (when not traveling) either in bed or lounging on my couch, this was important. Being comfortable in bed and on the couch were my two biggest concerns about the SP2 going in.
And it's certainly not perfect. I can't really lie down and use the SP2 with my knees propped up while still having a keyboard, while I could do that with a normal laptop. Instead, I lay it on the bed and then I lay on my side to use the computer with the Type Cover. Hard to describe but I hope that makes sense. I can use it lying down "in my lap" without the Type Cover, but then it's just a tablet. The weight there doesn't bother me.
On the couch I use it much more as a tablet, either having the Type Cover folded back and then propped up with the hinge, or just without the hinge. Both are comfortable and the weight is not an issue.
I guess what I'm trying to say is that it is certainly not perfect. As a laptop, it's not as comfortable as my old ThinkPad, for various reasons. As a tablet, it's not quite as comfortable as my iPad/iPad Mini again, for various reasons. But, the ability to have one device that does both of these things FAR outweighs the cons, and that is ultimately what it came down to. I'll be keeping the Surface, which I wasn't convinced I would after a couple days use. It's a really great machine that is incredibly powerful and flexible enough to be used at a desk, on a couch, in bed, on a plane, etc. Typing on it with the Type Cover is an absolute joy, and while it isn't a ThinkPad, it comes damn close. I miss the TrackPoint from my ThinkPad, as the touchpad is pretty poor, its certainly useable, and I'm very surprised with myself as to how much I just touch the screen for most things, and how natural it feels. I definitely would NOT have guessed that would happen.
The weight certainly isn't great, and if it was just half a pound lighter I would be a much bigger fan, but its just not a dealbreaker. Keep in mind I'm only 5'7" so if you're a big guy this may be even less of a deal.
Lastly, my only real gripe is the high DPI, which is really a Windows problem. Chrome is virtually unusable (even with tweaking settings), so I've switched permanently to IE 11. Both the Metro version and the desktop versions are great. I'm upset about that because my Android phone uses Chrome, and I miss being able to sync everything up (tabs, history, etc.). Also, Spotify has proven to be almost unusable, due to the DPI settings. On default, the touch doesn't register correctly, and when you override compatibility to ignore DPI settings, everything is so tiny on the 1080p screen it is difficult to use. I use very few x86 apps so this isn't a huge deal for me for the time being, but definitely something to consider.
I went with the SP2 versus the S2 or an iPad, even though 90% of the things I want to do can be done on a tablet, the other 10% makes it impossible for a tablet to be my primary device. Even things as simple as having multiple tabs open and using Alt-Tab to quickly cycle through them, which is the way I browse the internet, is SUCH an improvement over the traditional iPad experience. The ability to use the occasional x86 program is just really fantastic, and IMO worth the additional $ and weight premium over the RT.
One more thing - there really needs to be more Metro apps. The store is pretty pathetic right now, don't let anyone else tell you otherwise. I honestly have little hope that it will get better. The Metro experience is so fantastic, that I'd love to be able to use it more. Unfortunately, it is not there yet.
Hope that helps - it was a bit of a ramble but those are my thoughts after using the SP2 for about 3 weeks now.
Edit: I completely forgot. The screen quality BLOWS ME AWAY every single time I've used it. It's so crisp, has such great contrast, and is simply fantastic. This looks and feels like a $2k computer (which it so happens to be, but that's not true of the 64GB model, which, for all intents and purposes, is the same).