Pros
HyVee has a great opportunity for young employers to move up to management positions and director positions. The employees that I've worked with over the years were very diverse. Full time employment is always encouraged and there are 401k and Medicare benefits. The medicare is also worth paying for and they use Cobra for insurance. HyVee also prides itself on employee owned, even on the part-time level. Management is usually very open for ideas to better the department or possibly the whole store.
Cons
It is easy to get sucked into the company if you start at a young age. This is different for everyone but I see a pattern in the technique used to lure employees to work full-time. That is a personal con of mine because I avoided college because of it. You may also find yourself working incredible hours when getting paid salary. I've seen assistant store directors work upwards of 60-70 hours bi-weekly.