Ventajas
Very relaxed atmosphere. Dogs allowed. Casual dress code. Most of the people are very nice, including management. Sadly, most of the managers and directors aren't good at managing employees, clients or expectations.
Desventajas
Management over promises to clients and under delivers. While I was there I repeatedly heard of project managers lying to clients and then not delivering. I saw more than 4 people quit while I was at the firm (there firm is around 20 people). Also, although it's widely believed by second tier management that many things have to change in order for the company to work well, and they've told the owner, nothing ever changes. Owner keeps acting in a manner that only hurts his employees. His underling allow it so as not to ruffle feathers. Owner over promises on deliverables, not even knowing what the deliverables are. Most employees who have stayed there long term are close friends of owner and stay because their pay is good or feel trapped there as jobs in the area are scarce. Many insecure, unhappy employees that constantly talk about quitting.