Just finished watching it - actually it's like: the less you know about it before, the better it is. I was expecting some mystery / thriller thing and got pretty much carried away - it just doesn't let you catch breath. That's about the most important point to make it work because thinking about the stuff you see would very much spoil it all.
The plot and the characters are rather thin, but a supposedly authentic video like this would be the same way pretty much, wouldn't it? I didn't really like the end, but there was not much else to expect. I'd give it a solid 8/10.