Anyone using "Small Green Computer" devices?

Your experience?
Do you mean small computers like the Intel NUC?  Or, do you mean "green" network switches that go into low power mode when no activity is present?
I've have a Vortexbox Appliance from Small Green as my ripper and server.  It's been dependable for almost 4 years now.  
Have you compared the sound of Vortexbox vs. MacMini/A+, Aurelic products or other streamer/renderers? Please tell us what you heard in any comparisons. Cheers,