The only problem I have with both devices is the short battery life. How have you fared with that, Roger?
I have a micro USB cable on my desk for charging my phone (HTC Desire, so once a day); because of this it's no problem to plug the keyboard or mouse in occasionally. I get a little over a week out of the keyboard at work, maybe three to four weeks at home.
It feels like the mouse lasts a bit longer. Charging the mouse results in it getting warm, which I find uncomfortable, so I tend to do that overnight. This is not a problem with the keyboard.