So far the only snag is that I can't get bluetooth to work properly - there turned out not to be a built-in unit, and the USB pod I tried doesn't want to work at the distance from the computer to the nearest table - I think because it's teeny and has no antenna. It's sensing the keyboard and mouse but doesn't pair unless I'm about a foot away, which is a bit pointless. So for the moment I'm using a 5M USB cable and the old Mac keyboard and mouse, not ideal but they will work well enough until I can find a decent USB stick. Before anyone asks, the mouse and keyboard work fine with the Macbook, so it's the stick that's the problem.
This is good enough, and was cheap enough, that I might get another for my bedroom - it's cheaper than the Android smart TV box I briefly played with, and I find OSX a lot more user-friendly.