Pros
They connected me with many great people who are in the same boat. Other than that, none that I can think of.
Cons
This was the worst employment experience of my career. I was recruited for a role and the whole process took over 3 months, only to be laid off in 1 month. I was skeptical about the stability of the job I was being recruited for, and every time I asked questions or raised concerns, I was dismissed. I was told the client and contractor had a good relationship and that the contract was likely to renew multiple times. In reality, the contract expiration was in discussion the entire time and I was made aware of it on my first day. Marathon claimed they weren't aware of this and I don't know what's worse - to have such a poor relationship with the client you don't know the basics of your own contracts or if they did know and just chose not share the info with their candidates. Either way, several people in my cohort and I were sold a lie. I would advise to keep looking if you are considering contracting for them.