I worked at Microsoft for 6 years, and these are standard issue in every conference room. Most people there have never even used one. But I ran dozens of meetings a month with hundreds of people around the world using one of these, and I LOVE these things.
They're deeply integrated into Microsoft's Office LiveMeeting and their newly rebranded Unified Communications (now called Lync). If you're in a company with remote office locations, where you need to run lots of meetings - this is by far my personal choice with how to go. The hardware works great once you learn how to use it, and isn't very hard to use.
It has a 360 degree panoramic view that is placed via LiveMeeting at the bottom of your screen so you can see everyone in the room you're meeting with, and then it has a larger video window that shows the person who is speaking at that moment in a close-up. It switches from person-to-person using a directional microphone.
Microsoft now offers LiveMeeting for a low monthly fee (I know this because I just started using it at the startup I'm now at) and it's reasonable for even a small company.
I did find that these have a tendency to need repair, mainly because (I think) conference rooms at Microsoft are used heavily by lots of different people - and in each meeting a different laptop would be plugged into the device. So I'd recommend that you either keep this attached to a dedicated computer, or that you buy a maintenance and protection plan.