i am using it since about 2008 , it was i think version 5 or something like that back then .
i first used it as a virtual machine on a vmserver 2 on xp machine (i know ,dump setup ), managing my home network.
at about 2013 i set up a system with a dual core atom and 4gb ram with 6 disks as a server and router for two wifi (one free ) and a wired network and of course the filtering of the internet traffic .
i am very pleased with the futures and the functions . it has a server almost for anything with a one click installation and uninstallation . organizer, mail , router , dns server , cloud services , firewall , charts , details about network traffic , file server , multimedia server i havent found a need for a server that clearos didnt cover . even virtual machines and asterix is possible to host.
i also used it for test purposes as an adsl bonding solution , with very satisfying results .
i also have to mention that i am using the free version (now i have 6.9 version -mid 2017-) so the purchased one must be a carefree longtime solution .
I used version 6 for a while a few years back, it was awesome.
I could see everything that was happening on my network in real time, spectacular !
The add on tools were also great.
I am giving it another try with 7.3.