http://www.kinesis-ergo.com/shop/advantage-lf-for-pc-mac/
The only flaw is the row of horrible, rubbery, membrane function keys. I don't know why, but they just won't fix them. That said, I just remap my common F-keys (Visual Studio user) to other key chords and get on with my life. The firmware allows on-keyboard remapping and macros, by the way, so my Caps Lock ==> Esc remap follows my wherever I go.
If anything, I'd rather that the separate key wells were even a bit further apart. I don't know how people can type with their wrists jammed so close together, even with the Atreus's angled halves.
By the way, on the Kinesis, the hand wells are actually dished. They achieve this using a flexible PCB that's split into separate 'fingers' for each row of keys. To my knowledge none of the 'hacker' keyboards are dished like this.