Pros
ADT has a slowly dissolving base of 'old-guard' employees that are generally competent and good to work with. Some positions at ADT allow limited telecommuting, depending on the manager. For salaried employees, it is rare to hear of a firing. Generally people who leave ADT are either laid off or leave of their own accord.
Cons
ADT's management lacks foresight and refuses to plan beyond the next fiscal period. They consistently pass up opportunities to save themselves money in the long term by investing in their important infrastructure. Without clear vision and leadership, they often fail to complete projects and then announce them as a success nevertheless, leaving a variety of redundant technologies in place with no clear standard.