Pros
Your boss will be the company owner who is a Pharmacist, like you, who has done everything he will ask you to do, himself. He's available on the phone if you have clinical judgements to make in the field and you need to talk to a colleague for a second opinion. He is also lets you say yes or no to assignments depending on your preferences. And, when it comes time to part ways because you've found a full time opportunity, if you did a good job for him, he will provide you a positive reference that virtually ensures you'll get the job.
Cons
The schedule can be random but this is to be expected in the relief sector. Plus, as I said, you are free to say yes or no to any assignment.