The Logitech MeetUp thrives in a huddle / small room environment. The fish-eye lens on the camera has a very wide range of vision and allows participants to sitting close to the screen. The mic array does a good job picking up voices and the speaker has a balanced tone and sufficient volume. Not suitable for larger rooms. The Rally would be a better solution.
While the other cameras offer similar solutions, we found for the price to features, the meetup met our needs the best. With the trio, we had issues with Poly's software which the meetup gets around by being able to plug directly into a PC. The panacast, while it worked very well, we would have still needed to pair it with the rest of the equipment for a full experience. With the meetup, we have only needed the meetup, the PC, and an iPad as a controller.