I've been using it as a linux server and its been very reliable and handles a sizeable work load.
Great unit for the price and runs silent.
The Bois has great settings for its use as a server or as a pc.However, for those who desire to have it has an esxi server be aware that this unit is only compat with v5.5, the cd for the quick install of this gave me constant errors in finding the built in NIC.
The price is very good.
It seems to do what I got it for well and I had been considering getting another with upgraded CPU and RAM for a virtualization server, but between all the odd Lenovo idiosyncrasies and limitations, and this obnoxious fan, I'm now having second thoughts on that.