The system was actually built about 3 years ago (hence the price that some are complaining about).
I use the system for Photo and Video editing, Motion Graphics as well as gaming. Because of this I wanted it to be dual-purpose and not a dedicated workstation (e.g. Xeon's and ECC memory etc.)
When I got them the 580's were good video cards while not being top of the line. They're definitely feeling their age, but nothing in this system has crapped out on me over the last 3 years, not even the HDD's.
The name "Behemoth" came more from its dominating size in my living room as opposed to any technological prowess. It's been a running joke for me over the years that any new build gets named as the Behemoth while the others are relegated to names/positions like "Old-Geezer" and "Has-been".