Rain
I don't think this thing is intended to replace a desktop or a laptop. It merely adds a layer of functionality to a HDTV.
Just like tablets and smart phones. Some people probably grow ulcers trying to argue how much they suck while others see an added opportunity to be creative and use them in conjunction with everything else.
True, but being forced to run off USB power really limits the processing power and the form factor limits everything else. Thus I think the NUC (or Mac mini) is better and allows for much more flexible configurations. And smart TV's already let you stream stuff and even connect ASCII keyboards and surf the web. So I think it's a bit of a niche product.
But smaller and cheaper is always good.
Those NUC look an awful lot like Mac mini (which has HDMI out). Not saying one's better - it's always subjective depending on one's needs.
The Intel NUC's are only 4" square, which makes the Mac not-so-mini by comparison (don't take that as a real knock on the Mac, as it's still very small and unobtrusive). At 4" square I start thinking, "Hmm, what could I build a computer into?".
I'd get one, but by the time you fully configure it the price is up there quite a bit.