Pros
The actual educators I worked with were professional, courteous, and had a real concern for their craft.
Cons
C2 has recently begun pushing STEM; if you don't teach a related course, even if you're already established at the company, you will very likely see your hours reduced and reduced and reduced. And then, C2 will tell you its your fault and you need to teach more subjects. But, if you do teach STEM, you will make less than half working for C2 than you would have tutoring independently, and you will have to cover three students at a time. It doesn't take a math major to know where all the money is going when you have three kids in front of you but you're only making 20/hr. I've also noticed that C2 is dispatching hacks to boost its reviews. This is clearly not one of those.