I know: 4 months since this post but...
XLobby puts 19,529 BluRay Discs (That's whats available as of today on Blu-Ray.com) on any screen in your home - and unlike with the Sony "Boxes", you can watch more than 1 title at the same time on different screens.
And I know of at least one installer who has "ripped-out" several of those Sony "400-disc Blu-Ray boxes" at 1 job and replaced the whole (painfully slow and expensive stack of BD carousels) with 1 XLobby server, some Lacie NAS Drives, and a few clients.