I had the Atrix , stiil have, is running great ( but slow ) with the lapdock.

Idea is absolutelly great, HW reall OK, but in software was never completly done. It felt like was more like a PoC.

I was pretty dissapointed by Motorola not following this idea. It was kind of ahead of time.

Like others commented, very few phones have a HDMI interface.