Hello again Ian,
I forgot to mention, in answer to your questions, that the one I've got is quite easy to use, as it has only rather basic functions, and thus no menus or settings to navigate; it is also very easy to transfer the results to the computer afterwards via a simple USB connection.
However, among the many features that it does not have, there are a couple, the lack of which might make it worthwile to also look at some of the higher-spec (and, alas!, higher price) cameras out there.
Firstly, it would have been very useful to be able to turn it on and off by remote: as it is now, one has to turn it on and off with a button on the actual camera, which means that the first and last seconds of each sequence will be wobbly, and also that it has to be turned on and off somewhere where you can reach it.
Secondly, I would also very much have liked to be able to use it for still shots; again, this is of course something that requires a remote control function (and, ideally, a remote viewfinder, either a dedicated one or as an app).
Thirdly, the option to choose between a couple of different levels of resolution (not necessarily including HD) would have been nice.
In the final analysis, as I think already said, I found this one value for money, if only just, and having tried that sort of filming, I now know that sooner or later I will get a better one; in the meanwhile, I'll use the one I've got, while the money I've spent on it has helped me better understand what these things do and what to look for when I'm ready to spend a more serious amount of money on one.
/Mattias