Pros
It's one of the more legitimate employers for English teachers in China (if you go with the main branch and not the franchises, I can't speak for them). You always get your pay on time. Your visa is 100% legitimate and your fees for acquiring it are reimbursed.
Cons
They underplay the amount of administrative workload in the recruitment process, stressing how they have lesson plans already set out. However, once you're there they expect you to make your own and you're constantly grading tests, homework, and doing progress reports. You also have PTMs (parent teacher meetings). Your weekends are especially long, you work 10-11 hrs (although you get a decent lunch break) and your teaching for 6 of those hours. (this is all for the children's schools, I did not work at the adults' centers).