Pros
Children's is a rapidly growing institution and that growth is exciting to watch. It is also rewarding working for a non-profit with a worthy cause, caring for sick children. Children's is a high profile hospital in Dallas and will look good on your resume. It is also the best children's hospital in Dallas and it is good working for the best.
Cons
Unfortunately it is not always a pleasant place to work. Departments do not cooperate as they should and can be actively hostile to each other. Even within a department, there is a lot of cliquishness and backstabbing. Unprofessional behavior by employees will frequently go unnoticed if it is not causing problems for that employee's managers. If you are not in a clinical position, resources for professional development and training are very limited except for a select few favored employees. Children's is also one of the least family-friendly places I have ever worked.