Pros
There are various projects and types of interviewing. My project and probably the majority are in person sureys/studies. They pay was good and mileage was reimbursed, but be sure to have an economical car. I particularly liked the hours and being in charge of my schedule. It fit perfectly for me and my situation. Productivity of the team was highlighted but I never felt pressured or forced to produce.
Cons
My project had field interviewers arriving at random addresses to attempt surveys without residents aware of who we were 99% of the time. Other 1% might have seen something sent in the mail. I'd estimate that 15% of people were annoyed, especially since they assumed it was soliciting. The worst part of the job was having to enter properties and never knowing how the residents would react. Some residents were aggressively rude and a coworker was almost assaulted with a weapon. You are expected to visit every address, regardless of the crime/reputation in that neighborhood or even very rural areas that felt unsafe at first. Guidance on entering private properties was minimal and so was training on documentation/notes for each encounter. Short term a 4. Long term maybe a 3 or less.