Giving up the Natural 4000 once again

So I’m re-purchasing another MS Wireless Optical Desktop Pro tomorrow.  I’m giving up the 4000 once again.  This time though I doubt I’ll ever go back unless the keyboard itself changes.  And with changes I mean the softness of the actual keystrokes.  If it stays the same as it is right now, which I believe it will, I’ll never buy the 4000 again.