Pros
Schedules are extremely flexible. The company pays close to the top of the hourly range of other employers. I know this because I've applied elsewhere and end up determining that Safeway is, all things considered, a very good employer. Benefits are paid at 30 hours/week.
Cons
If you needed to work full-time (30-40 hrs) either for the money or for the benefits, it can be challenging to get/maintain hours in the grocery industry. I know some pharmacy assistants and technicians who pick up shifts at other stores. Each pharmacy manager has a target amount of hours of staff time. If you need to work more, employees are often willing to give you shifts. There isn't, as far as I can tell, opportunities for career advancement for pharmacy technicians.