So this is an update. I have four of the things, two revision 7 hardware models and two revision 10 (newer). The newer models have a number of changes to the way they talk to security software that renders them incompatible, but the bigger problem is three of the four consistently lock up and require a power reset to work again. This will happen within hours-days and renders them all but useless.
Original review: Picture quality doesn't seem as good as the more expensive Foscam, but then I got two of these for the same price (almost). Build quality is ok, not great. Screwing on the wireless antenna on one unscrewed the antenna mounting from the camera. That's not great. Easy to fix.
The cameras default to 192.168.1.239:81 for reasons that are beyond me (Why no default to DHCP and 80 ffs??). The software provided on CD is rubbish and doesn't work (for me), but Tenvis have completely different software available to download from their site which does work.
On that note, there is a web site, and the web site has support and a forum in which people provide actual advice.