Pros
I think the biggest pro to working with sylvan was building the relationships with the students. I am a certified teacher and before I got hired with a school district this was a great start and great resume builder.
Cons
I truly did not like their system for teaching kids, specifically 3 at a time. I think once you work there for 6 months you start to get the hang of it, but, I worked there 2 months before I got a classroom job and I still was not used to it. Also, the tuition to sylvan is god awful expensive. With that said, they pay horribly (for tutors that is). I think it was right around 10 dollars an hour, and I usually got like, 8-10 hours/week. I was glad to get hired as a teacher and start making 37K/year vs. the 6K/year I would have made there :)