Pros
Interacting with the students is the best part of the job. I enjoyed planning and running lessons. Also, some of my colleagues are good people, and my first subject head was wonderful.
Cons
There are so many, and the root of the problem is the rather authoritarian management, which so fears any question that threatens the status quo that it avoids open dialogue at all costs. Assessing the organisation's product and service against its own slogan and against the needs of clients in an evolving education landscape is surprisingly not a priority. The profit motive drowns out any consideration of the organisation's ethical obligations to its various publics (especially its employees and its students and their parents). If you want to teach because you care about the future and are drawn (as I was) to the organisation's promise to nurture the love of learning, you will be swiftly and sorely disappointed after you start work here.