Summary: I have a fairly old version of this switch, H/W Ver D3. It took me over a year, and first replacing a ton of other hardware, to discover that THIS 'efficient' device was efficiently causing network problems.
Summary: Very fast, with relatively low energy use, but how on earth they can sell a so called green product that doesn't have an on/off switch I will never know. Also the power supply is an old style transformer and not very efficient.
Summary: A really good and simple to use product. Price and warranty are fantastic as well (especially when compared to both home and business 5-port switches by Netgear). A highly recommended purchase!
Summary: as unmanaged switches go, this is amazing value for money. it does exactly what is should: it is fast (yes it is!), it is simple to install (plug'n'go) and it is quite nice looking (well...). it also consumes very little power (max 9W) which is a good thing. gigabit for the masses!