Control, Alt, and Command are all accessible with just your left hand. Control is to the left of A, where Caps Lock normally is. While this is superior for UNIX use, it does bother some touch typists due to the lack of symmetry (there's only the single control key).
The lack of dedicated function keys and arrow keys is a total non-issue after a few days of use. And if you're using a Mac, the media controls are located on ASDF, rather than the function row.
I wouldn't trade my HHKB for any other keyboard, honestly. But the layout does take some getting used to, especially if you aren't a UNIX person.
Oh, and the 87ub Rigs is espousing? Yeah, that's well over $300 by the time it gets to you.