I spent a great deal of time trouble shooting another issue on the phone the other day with Apple help and whilst we we were waiting for something I mentioned that, whilst I loved the new mouse, it often took quite awhile to 'wake up' if it had been switched off and then on again. In fact I found that I couldn't get the imac (new gi7) to recognise the mouse after putting the mac to sleep for 8 hours or so and switching the mouse off - I ended up plugging in my old Logitech bluetooth one just to shut down. A restart sorted everything out but I did notice that putting the imac to sleep again AND switching off the mouse and switching it back on again to wake up the mac took between 5 to 20 twenty seconds - the longer the mac was asleep the longer the mouse took to be recognised. Now, the point is - my trusty Logitech (also bluetooth) is ALWAYS INSTANT!.... I mean, there's no lag, ever! The Apple guy actually repeated this on quite a few macs in his office or asked his work buddies to do this and the senior guy in his office said that a 15 second lag was normal. I said - you're kidding.... my Logitech works on your brand new imac and is always instant (and it has touch left and right momentum scrolling like the magic mouse). The Logitech also has a much faster cursor movement across the screen. I guess what I'm asking is if the magic mouse lag time from wake-up is normal and if anybody else use a third party mouse that has instant response from wake-up.