Yes, I've been an observer several times and had my own cat communicated with.
It's hard to describe. Not psychic, really. More like perceptiveness of the animal's body language, the animal's moods and personality, the dynamics between animal and person, etc. It depends on the animal communicator, of course. Some of them are just very tuned in to subtle things and are good at recognizing them. Others are a bunch of hooey.
A couple of examples: The animal communicator said she felt a huge void around my cat and that she was lonely. At the time, I'd had my cat for only three months; prior to that, she was in a shelter for two years after being surrendered by her owner. So yeah, I'd say she was lonely- and at the time, I'd only had her for three months. The animal communicator did not know any of this ahead of time.
She also said that when an animal makes a contract to find someone, they often look for someone who is like them. She said my cat and I have matching personalities, that we're both very strong and adaptable. Not sure if that describes me very well, but I definitely saw that in my cat almost the minute I brought her home.
One of the funniest things I learned was that my cat didn't like her collar. It was red with hand-painted mice and I thought it was cute. But after my cat communicated that she didn't like it, I realized that it was kind of kittenish looking and that she is just too dignified and proud to enjoy wearing something decorated with cute little mousies.
You have to take it with a very large grain of salt. I found it to be very interesting, and most of her perceptions were right on. I think you'll probably enjoy the session. Can you post tomorrow and let us know how it goes?