Marco Arment, writing about the Microsoft Natural Ergonomic Keyboard 4000:
The 4000 had two major flaws: its keys were too mushy, and its right side extended out so far that I practically had to keep my mouse in New Jersey, which isn’t great for ergonomics.
[…]
The Sculpt Ergonomic Keyboard looks nice, is wireless,2 and appears to fix the size issue by splitting off the numeric keypad, but those keys have me worried: they look like cheap laptop-style scissor keys, and have a good chance of being too mushy.
I had the same issue with the 4000 as Marco. It was great on my hands and wrist, but the mouse being so far to the right really killed my shoulder and elbow, especially after my surgery last year. I’m looking forward to giving this new keyboard a spin when it ships this fall.