It is a dock for the Atrix phone, and ideal for that. But, like some others here, I don't have an Atrix, and use it for Raspberry Pi development. The snag is that, of necessity, the micro-USB and micro-HDMI ports on the Atrix are female, so the connectors on the Lapdock are male, creating some interesting cabling problems, but if you are using a Pi you will have read all about how to do it. Anyway, it is a bit ugly, but workable, and lightweight, and although I think it is not supposed to work that way, the Lapdock's rechargeable battery will power the Pi for a while.
Having sorted out the cabling, I also used it as an HDMI video monitor in conjunction with a camcorder. As a much better size of screen than the usual viewfinder, it is quite helpful, except that you will get audio output from the speakers, whether you want it or not, and possible feedback problems. That is because the Lapdock has only minimal intelligence, and the controls only signal to the Atrix, via USB, to turn the volume up or down, so if there is no Atrix there is no control, and you get whatever is in the HDMI data stream regardless. No easy way of fixing that, without a very expensive HDMI licence and some fancy hardware, so I suppose I should open up the Lapdock and do something crude like snipping the speaker wires.
So, as always, when using something in a way that the manufacturers never intended, you need to be aware of, and take responsibility for, the possible unintended consequences. With that limitation, it is a decent enough product. The keyboard and screen are perfectly usable on occasions when you don't want to carry around a proper HDMI screen. If someone were to make a nice cable adaptor which basically resembled the bottom end of an Atrix phone, and sat snugly in the dock, with standard HDMI and USB sockets, it would be nearly perfect, but I don't hold out much hope of that as it is only a minority of users who would want one.





