Should be tablet based
I have an Atrix and think it's great (apart from the wifi problems I am experiencing at the mo). I carry a laptop for work and sometimes tether the two when I can't get free wifi. However I wouldn't buy the lapdock at the price they're asking to use instead.
What I would prefer is a tablet based dock. Basically a large screen and extra battery which I can slide the phone in and enjoy mobile media, web browsing and charge the phone back up. Should be pretty cheap as well. Perfect for kill time on long journeys. Large screen sat nav anyone. I've tried doing serious work on a netbook and I can't so I see no difference with this lapdock.
Even the media dock seems overpriced to me at £50. You get the mini HDMI cable with the phone and if you have USB ports on your TV plug in the lead to power and charge the Atrix. You have no remote control but hey you saved over £50 for some exercise.