Pros
I have worked in many professional services organizations. Most will go out of their way to "invent" a new service to solve a client problem and generate revenue. Schellman focuses on on being the best at IT security, audit, and compliance and we only recruit people that are passionate about and experienced in these areas. This has allowed us to grow at a very fast pace by proving a focused set of services at a quality significantly greater than Big 4 can provide and other niche firms can mirror. Additionally, when assessments is the only line of business, there are no "loss leader" projects where Schellman undercuts its fees in hopes of generating additional product or services work. That approach never works out for employees or clients.
Cons
If you do not like to perform technology assessments, this is not the place for you. Clients expect personnel at all levels to be experts. While a CPA firm, Schellman is more like a law firm and managers and those aspiring to move up in that direction need to understand that rolling up your sleeves is a reality at all levels.