Pros
Good place to start a career. You will learn many facets of a business and the people are friendly. Custom has many "big company" aspects, which are a very good thing to learn (CRM, sales goals, etc.) Very interested in staying at the bleeding edge of technology and invest accordingly in their partners. Work/life balance is decent, you are not normally given a hard time to take off or for sick days. Can be a bit of a pain to leave early or arrive late (for whatever reason,) though that can vary with manager.
Cons
Compensation is poor, even for the area. Like to take advantage of new starters, I was fortunate to start at a half decent salary, but discovered that fellow co-workers (same title) started at significantly less than I did. Also, for the technical people, they like to ride one or two engineers to the bone and they burn out rather quickly. Very sad to see as those tend to be the most intelligent and hard working people. Similar story for young talent, squeeze out every last bit for as little money as possible until they realize they are worth more and leave. CEO seems more interested in making enough money to keep his racing hobby up than actually growing business. Lastly, there is a bit nepotism. Those who have been there for many, many years tend to stick around despite the fact that they are not very good at their position (by quantitive measures, not qualitive.) It is frustrating to see when they have such a fertile ground for talent, yet ignore it and continue in a viscious circle of being, "just good enough."