Maybe from a hardware perspective, but not from a usability perspective. No right control key. No page up or page down. No home or end. No delete key. No number keypad. I was in love with the ergonomics of it...for about a day.
Not sure how those work if you're not using a Mac. Maybe you can remap the right Option to Control? Control isn't near as important for most Mac users since Macs use Command where windows uses Control.
That said, once I did the ctrl/caps remapping I've used that keyboard extensively with emacs and only occasionally did I feel any real limitations.