Extremely High-Stress, and constant on-call work leads to poor work life balance no matter what they preach you'll have to get used to many difficult situation talking with clients unhappy with you and the company, and you'll have to find replacement nurses when on-call in sometimes a matter of hours. If you aren't able to do this you office numbers and reputation suffer as that is expected
They will pay you as little as possible as you are forced to perform all the responsibilities of your future title at significantly less pay. This lasts for years at times
Be vary wary of office politics and the faux-sincerity of coworkers as well as your management, they will push a team and family culture until they want you out (usually based on office politics and very rarely performance from what I've seen) and after that you realize the only reason to push their "culture" is in order to make you work harder for less money. It's an interesting and good plan in short-term, but they will realize this in not sustainable in the long-run when you have more than 5 offices and only a few which are very profitable. Turnover will continue to increase unless leadership and decision-makers change something; they'll have to find out the hard way most likely, but hopefully they can have some foresight and let go of ego.
The commission structure is misleading and unfair based on different levels of success in an office due to new open vs a fast-growing office. It's also frustrating that the success of the office determines commission and bonuses rather than individual contribution. Regardless, the commission structure they present to you will make it seem a lot more lucrative than it is. Decent money will only come in 4+ years at the company and by they you can still always guarantee they will get the most work out of you for as many months as possible without paying you any more or giving you a promotion based on performance as they pitch.