Liars! Their own specs says it's made of "Scratch-resistant ABS plastic body and glossy plastic black top", so it's a (cheap) piece of plastic, with an external power supply.
Moreover, not only this is (IMHO) too much for a pice of plastic with a kinda cheap external power supply, it's likely gonna either fry your HDD or blow your ears, 'cause plastic (HDD) cases are far away from any known affordable thermal solutions for both HDDs and optical burners.
Considering it's USB 3.0 (unlike wanted TB) connectivity, even if they would made it of aluminum, i won't pay more than $100 for a USB 3.0 to dual-SATA / eSata / FW800 adapter with a couple of additional USB ports and questionable front SD reader.
For me OWC is a tricking company. I bought some products from OWC, including cheap Chinese MBP batteries, or "mini Data-doubler kits" with some cheapest screw grommets and the screws 'em selves, nothing to say about fake (not made by Apple or OEM) second HDD cable.
This ones seems to be the next naive MAC users rubbery attempt from OWC, IMHO.