Is this part of a new movement where people move "the cloud" into their own homes?
They are inefficient for daily use, but great for lab work. I spin them up, run whatever distributed task I need on 8 cores with 15K SAS drives, usually distributed Sony Vegas renderer, and shut them down. They also make a great lab for virtual machine work, so that does mean bringing the cloud in-house. :)
The X366 is a serious piece of hardware that later got renamed to 3850. Their current incarnation is http://shop.lenovo.com/us/en/systems/servers/mission-critica...