Pros
You can make a difference in the lives of your employees and customer EVERY day. Strong intrapreneurial culture--you own the performance at your site and are able to develop your business within the SBM framework. Most, if not all, senior leadership started in entry-level management positions. Not saying that every site manager needs to aspire to be a VP, but if that's the career path you want to choose, SBM can help you get there.
Cons
Work-life balance can be difficult to manage. Expectations are high so even the best at time management can struggle to strike a decent balance. Learning curve can be tough--lots of effort has been put into making the manager training more relevant, but expect to jump through a lot of hoops up front, demonstrating your ability to walk the talk before being granted any degree of autonomy.