That M15 keyboard is actually one of the most sought-after ergonomic keyboards. It's got the same keyswitches as a Model M and is also one of the most adjustable split keyboards ever made.
Show Image
(http://www.clickykeyboard.com/_ebay/M15/M15-007.jpg)
Aha, thanks for that pic. I thought from the first one it was only adjustable in the one plane, that looks a lot better! My bad :doh:
As much as I love the Model M's keyswitches I had to stop using it as it was too painful on my MCPs (http://en.wikipedia.org/wiki/Metacarpophalangeal_joint), I only really use low-force boards now. Both my Ms are in storage, I think one of them needs a new controller PCB too (it had a run-in with a rogue pass-through swipecard reader...) I found them to be raked quite excessively too, I'm no fan of negative tilt but it didn't really suit me - there's a lot of hand movement with your wrists in flexion and it was asking for trouble really. Hopefully once my Cleankeys (http://www.cleankeys.co.uk) arrives I'll be able to type in reasonable comfort...
Stone