I purchased ME2 used via Craigslist and do not have Cerberus Network access. What are the benefits to having access? I'm trying to decide whether or not to purchase access.
It gives you access to some free (well, not REALLY free since you have to pay for it ;)) DLC's and possibility to buy others.
Here is a list of DLC's in ME2, the ones marked as "free" are available to any CN member.
In my opinion - it's definitely worth it (especially for Zaeed, an additional squad member + nice side quest), and other DLC (the paid ones) are also very good, but play 2-3 hours and then decide.