A firmware update coming around the September timeframe adds true AES 256-bit hardware encryption to Samsung's 840, 840 EVO and 840 PRO SSD products.
Two flavors of encryption are covered, Trusted Computing Group (TCG) Opal and Microsoft's eDRIVE, part of Windows 8 BitLocker.
Class 0 SED is an important feature for businesses and end users who would prefer to only have the NSA steal their data. While we've had access to encryption for several years, hardware based encryption lessens the overhead and reduces the amount of resources needed from surrounding components.
A notebook is lost or stolen every few seconds in the world and the cost goes far beyond the price of the components physically lost. I would go as far as to say it should be mandatory for all businesses to use some form of encryption for all of their employee's notebooks.