Bought a new iMac two weeks ago. Went for the Wireless Keyboard and the Wireless Magic Mouse.

Batteries in the keyboard are still showing 100%. The mouse batteries are showing 70%. That mouse is going to eat up a lot of double AA batteries. Seems not smart that Apple (having of course tested the mouse and noting the problem) did not set the mouse up for rechargeable batteries.

I never shut off the keyboard, nor the mouse. But the keyboard is doing fine so far. But not the mouse. Besides, I doubt that shutting off the mouse will save on its batteries. One would surely be entitled to assume that with good design and no mouse action there is no drain on mouse batteries.

I've got to say that the mouse is functionally attractive. Among other things, scratching its back makes it scroll like mad.