For anyone wondering, this is a Prodigit 2000MU, and the full data sheet can be found by doing a web search for "2000MU data sheet" (Sorry, Amazon won't allow me to post a direct link!).
This unit is less convenient to use than others on the market, mainly due to the lack of an internal battery, which means you need to be able to see the socket you're monitoring. On the other hand, it's significantly more accurate than competing units, particularly at low currents (important if you're interested in just how much those devices on standby are actually costing). It boasts a typical measurement error of just 0.5%, which is excellent. To put that in perspective, a similarly priced competitor claims 1.5%, and the very whizzy, (and, at three times the price, very expensive) Efergy E2 manages a dismal "<8%", despite being "wireless everything" and providing pretty graphs on your PC etc etc.
I decided that basic accuracy was more important to me than flashy features, and have no regrets for choosing this product.
The unit I purchased from EnergyMonitorWorld was supplied with a Maplin Electronics sticker.