The disadvantages outweigh any minimal advantages there might be.
Cons
Bad working conditions, crowded office, employees must record activities in 15-minute increments so your time is billed to clients, owner reads every email sent out, owner is emotionally volatile. Most of the employees can't afford the health insurance, no 401k, eating at your desk instead of taking a lunch is encouraged.
Image Management took me out of a job I was unhappy with, and now - I actually look forward to work. I took a free trip to Nashville last year and am taking one to Seattle next year for continuous development, and the whole team gets along well. We are a close-knit group, it's a laid-back feel, and everyone is supportive and kind. There is no office drama, and it allows me to be creative working with clients who are local. It's fun to see a design I did on a popular website... or to see a logo I designed on a car that drives past
Cons
Expectations are high. It can be a lot, but thats why IM does so well to tell the truth.