Got mine up and running recently (staying with my brother and his girlfriend who got high-speed internet recently) and I gotta say while it's not what I thought, it doesn't really disappoint, though I'm pissed some sideloaded apps didn't work.
But the games they have are (mostly) pretty good. And I found a sideloadable Ouya version of OpenBOR (it's basically the most recent Android version, which sadly's been abandoned, but now there's an icon in the Play section) and so far so good.
Though it turns out they're already taking about a new model.