Ooh very nice! I am always tempted to get a HHKB, but not sure I can handle that form factor. TKL is the smallest I've gone and can't imagine going smaller, but I love the small footprint.

I don't recommend them for anyone that primarily uses the keyboard to navigate their window manager, finds themselves in a shell often, or relies heavily on keychords in complex applications (like an IDE). Smashing the ESC/FX row into the number row and sacrificing some or all of the 6 nav keys just makes for bad productivity.