It would be beneficial to know more about their clients. There is need to know if the clients are at the peak of their careers of new into the job space. Also, it is advantageous to have an idea of their fields. The fields may include information technology, engineering, public relations, education and marketing. But, it is more beneficial if your field is included. You need to recognize that if their services are spread across various fields, there is a high likelihood that they are more skilled.