Employees at ADT Security appreciate the friendly colleagues and good team environment. They also value the job security and opportunities to learn new things on the job. However, there are potential challenges such as issues with management, with instances of bad managers and mixed messages. Some reviewers mentioned being sent out unprepared or without sufficient training. The workload and expectations could also be demanding, with team leaders asking the impossible and KPIs set up for failure. Additionally, some employees found the technology and systems complex and challenging to work with.