They generally display them at the Davis Rally in New Hampton every year. They appear to be very well built, and have a range of accessories that make them a little more versatile than a plain old cargo trailer.
We looked at them briefly when we thought we wanted to travel with our dogs, but then came to our senses.
You might want to also take a look at Wags Trailers http://www.wagstrailers.com/ I have used one for over a year now. I have found that it pulls great behind the bike. I use it for my dog, traveling and shopping. Jeff and Carol are great people to deal with.