Pros
Medix (actually probably the staffing industry in general) is a pretty great stepping stone for recent college grads. It's a company that is growing quite quickly which gives you the ability to make more of an impact at 22 than you would at most organizations. You can also work your way up fairly quickly too if you are willing to work hard. They put value into their young staff which I don't think a lot of companies out their can say the same. You gain some really great industry and sales skills in this job as both a recruiter and account executive that you can take any where if you ever decide to leave.
Cons
If you are looking for a job that is a "work to live" then the staffing industry really isn't for you. It's a fast paced, sales job that's going to require that you work more than 40 hours a week. Some weeks will definitely be more demanding than others with certain projects but the reward (commission) makes up for that. Also, this is a service sales....meaning that your success depends on a contractor showing up for work and doing a great job. This is probably the biggest challenge of the job.