Pros
I gained a lot of experience in how to communicate with clients who don't understand computers or have the vocabulary to express their needs for printing or graphics, so I learned how to lead them and ask the right questions to find out exactly what they need, and FedEx Office's training (which is very good) gives an excellent grounding in how to do this.
Cons
The combination of fast digital printing and express shipping means that your job at FedEx Office is to fix it when other people have failed to do their job. And if it isn't possible to fix it, or if the customer comes in not understanding that 24-hour turn-around is expensive, they will get pissed off and take it out on the person behind the counter. There are some very nice people who come in to the store, but the rude, aggressive, unreasonable people are much, much louder, and it is easier for a single event to create a 'bad day' than to create a 'good day'.