Version 6 is very very good indeed, with all the virtualisation support as well. When I finally have the time, I will upgrade my unraid server from a Core2Duo CPU to a modern i7 based system. I'll then run Windows 10 in a VM for MC on it, as well as my home automation software. With unraid running too, it will mean that I only need to leave one server PC running 24/7.
I am really happy with unraid - been using it exactly as long as I have been using MC - over 9 years.