It's worth noting 4.1m Move's is from Nov 2010 whereas 8m Kinect is Janaury 2011.
But yeah, the Move is doing fine. Sony didn't give it the launch marketing launch or big software line up that Kinect had - and it's shown in sales figures - but the fact is the thing is still selling selling lots of hardware and software every week despite still being far from reaching it's stride.
The biggest criticism you can give the device is that it hasn't perhaps driven PS3 sales as much as you would have hoped, or Kinect appears to have, however give it a year, once the device has a strong library of games, has more consumer awareness and the PS3 price is cut closer to the competition I think that'll start to happen. Sony are trying to establish this controller for the long term and with that in mind it's off to a great start.
