Well, I tried both on my buddy's G5. All I can say is that I am not too impressed.
The problem is when the machine goes to sleep, it takes a while, if at all, for the devices to wake up with the computer, so you are sitting there trying to wake the computer with the devices, and it does not work. The computer wakes, and then it takes forever for the devices to be recognized. I can see the use for the BT mouse for a laptop user, but the Keyboard seems silly unless you don't want to use a usb hub and absolutely can't have any wires around. I mean, how far from your Powerbook or iBook screen would you really be sitting with a keyboard on your lap?
My Logitech rf wireless mouse is great. It wakes the Powerbook instantly, and never has issues.
I think those devices should have been rechargeable, like the iPod, and the Mouse should have been at least two buttons, but that is another topic altogether.