I too had the Atrix, the Lapdock and the multimedia dock. It was a good device, just hampered by the lack of RAM, the dual core processor (which was a bit sluggish), and the hampered Linux desktop; I too hacked around with it to be able to install all manner of useful tools (compilers, editors, office packages) and it was useful. The Lapdock had a good screen and was conveniently incredibly thin. I did miss a backlit keyboard though.

In any case it was years ahead of its time.

Sold all the components individually though - I think someone used the Lapdock with a Raspberry Pi in the end.