Yeah, and sure.
I just got mine yesterday, and it does take a while for games to download. (I'm at a hotel right now with abysmal wifi, so I'm planning on going over a friend's house later today to download a bulk of games.)
My Steam account is Dacvak, if you'd like to look through my games to see what I have available to play.
For the first few days, I'll be using the Steam Machine as-is, meaning no dual OS. My Steam Machine has a GTX780 in it (not sure about the processor yet, but I'd assume it's the i5). After a week or so, I'll be really experimenting with multiple OSes, and maybe altering the hardware a bit. That's when I'll be playing things like Dolphin with it.
And just some quick initial impressions: the controller is crazy. Definitely an interesting concept. It really is a cross between a normal controller and a touch screen, but it seems like the haptic feedback will make the difference in game. Just going through the OS, though, it's really easy to navigate and even type.
One strange thing that I barely noticed is that the controller's haptic feedback seems to use, like, a static charge for the "rumble" effect. At least it kind of feels like that. I could be making this up in my head, but I feel like there's an ever-so-slight static charge sort of "zapping" my thumbs at all times. It's almost entirely unnoticeable, even if you're looking for it, so there's a chance that I'm accidentally making this up. I'm going to have some friends try out the controller to see if they feel it, too. Either way, it's not something that would turn anybody off. Just a little quirk I noticed. (I think.)
Later today, I'm going to take side-by-side pictures of the console and controller up against every other console and controller (PS4, Wii U, Xbone, 360, PS3, Wii U Pro, etc) for size and aesthetic comparison.
Also, this case is incredibly sexy and sturdy. Thick metal (steel I think) with a good amount of weight. The machine is absolutely silent, too. I think the Xbone is louder. It runs very cool to the touch, as well. (Though I haven't put it through its paces yet.)
And FYI for anyone wondering, I already returned the second Steam Machine they shipped me.