Extra security & channel availability
Anand Tech editor Kristian Vatto says Pro 2500 differs from Pro 15000 by "TCG Opal 2.0 & eDrive compliant plus the Pro 2500 will be available in the channel as well (1500 was OEM only)"
PIty Intel didn't say that upfront. And, anyway, why not add these retrospectively to Pro 1500?
Chris.