I started using the Microsoft Natural Ergonomic Keyboard 4000 keyboard about two weeks ago. At first I didn't use the strange wrist thing. It looks strange and lift my wrists a lot.
Today I attached the wrist support thing and at once my typing is becoming faster and better. It looks like that thing makes the angle better for typing the keys. I've only tried this for a few minutes know. I will try it a little longer to find out how this works. It seems nice enough.