Pros
Depending which location you work at and who your manager is, it's a decently low stress job. You sign the person up and park their car. So as long as you have decent customer service skills and driving ability, it's an easy gig. It's great if you prefer a job where you get to be outside. Getting cash tips every day is really helpful, especially for those of us living paycheck to paycheck. If you work at a location that's slower, they'll usually offer a higher base pay to make up for the lack of tips. They offer a discount through Shoes For Crews, though the quality is meh. Depending where you work, work/life balance is pretty good. My manager was very flexible when it came to asking for time off for anything. But it depends who your manager is.
Cons
You have to work in the cold, heat, and rain. Lots of sun exposure, so if you're worried about skin cancer, maybe pass on this job. Depending how busy your location is, you are on your feet constantly and wearing your body down. If you work at a hotel where the business is very seasonal, you may not make much money at all in the colder months (but tips at the hospitals are steady year round).
The benefits are horrible. The medical insurance is mediocre and overpriced. They don't do raises, so expect to make the same base wage the entire time you work there. Upward mobility in the company can be difficult, and even then the management positions don't make much more money than team leads but have a lot more responsibility.