Pros
All of the full-time Populus employees I met in person were very nice. They left me alone to do my work and did not continuously ask me to try and place more people on my team. There is tuition available if you want to take a 1-2 class.
Cons
While the people were nice, they were not transparent and unable to answer my "tough" questions about benefits I had selected upon hire. The medical benefits changed during my contract and left me with even worse options than the original. An optional scheduled monthly or quarteryly check-in with a benefits advisor would be nice. In my first year nearly all of my internal contacts left the company. Very little encouragement for training, what was offered was nice "how to be a good employee" stuff, but I never found anything to enhance my marketability or prepare me for a next contract.