Pros
The company has great benefits, even for part-time employees, as well as fairly competitive pay for the industry. The hours can be somewhat flexible, but this has varied greatly under different managers I've worked for. In this role, you get a small insight into certain aspects of how businesses are run because there are opportunities to manage inventory, learn about safe cash handling, coaching and training, and auditory compliance (health inspector or third party audit.)
Cons
This is a difficult job because of the stress level. Generally, you are in charge of a store in the absence of a store manager, and all the problems tend to fall in your direction. You have to juggle many tasks every day such as delegating and deploying partners (employees) in the most efficient manner, dealing with customer complaints, dealing with various security issues, tending to/calling in repairs, all while there is a relentless influx of customers. It is very difficult to do perfectly every time, although it is satisfying when accomplishing it. The other big con of this role is dealing with disciplinary issues. You may coach baristas if they are doing something wrong, but you may not issue any punitive measures. You get all of the responsibility of a manager, but none of the authority of a manager.