I don't personally own a Surface Pro 2, but I have used them, and I'd say I've used one long enough to have an opinion.
I think it is a very nice little device. Not cheap, but I still like it. I really like the screen - sure it doesn't have the same pixel density as an iPad, but there's something about it that I really like. It's bright and the colour replication is very good. I like the fact that it is true HD. It seems a lot like the display in an iMac.
I think that the fact that they've upped the amount of RAM in it is very good. It'll play games better. With the 256GB and 512GB models you get 8GB of RAM, and that's quite nice if you're running multiple applications at once, or games as it boosts it. For me, it cannot replace the laptop I have (as it is advertised), but it is still powerful, especially for a tablet. And it's nice that the Pro runs the desktop version of Windows 8 - meaning it'll run games like The Sims 3.
It is not that light or thin either, but I like my devices to have depth to them. That's a personal opinion, other people like their devices thin and light.
My gripe about it is that it is very expensive, overpriced if you ask me. A MacBook Air, with the same specs (Surface = $1,300, Air= $1,250, aside from the storage capacity, only 128GB difference. A 128GB Surface Pro costs $1000, and has 4GB of RAM rather than 8GB. The processor remains the same, 1.7GHz Haswell i5) costs $50 less. The 512GB Surface Pro costs $1,800. For $50 less, you'll get a 13" Retina Display MacBook Pro with a 2.8GHz dual core i7, the same RAM and 128GB of storage. I would get something with better processing power and a larger screen, but that's me.