At will states are the best you can have. Neither the employer or employee is held in to a job they may not want.
Are you serious? Last time I checked, at most jobs you can quit whenever you want. "Right to work" holds no advantage there. A major DISadvantage is that it's much easier for an employer to fire you, or the ever popular being "asked to resign" routine. That's a farce anyway - if you agree to quit, the agency will say that you can still use them as a work reference, and they won't say anything bad about you. reality is, if they want to screw you, when your prospective employer calls you, and asks if they would hire you again, they'll say that you worked there, and no, they wouldn't hire you again. That's how they get around not being able to say anything about your work history with them.
Employees working in right to work states are definitely at a disadvantage. Look at salaries in the deep South. Read my post about CCEMS at the "quality ems agencies" thread. Employers in right to work states can do whatever they want, and pay whatever they feel like. They can treat their employees however they want, as long as they're not commiting sexual harrassment or discriminating.
Did you read the post by FFMedic 75?
"All SC systems seem to have a high turn over rate for various reasons. Most of it is because everyone is "at will" employees and systems like to threaten their employees with termination for bringing legitimate issues and problems to light".
"last I heard they have a huge amount of mandatory OT and you have to fill your own leave. I have also heard lots of reports regarding issues with management"
These things are all to typical with a place that isn't answerable to a union or other employee organization. Unions have the power to force the employer's hand, to force them to compromise on issues important to their employees. Otherwise, the agency will look out for it's own best interests, employee be damned.