There are many cons. I'll touch on a few.
I'll say first, as a BDA, you are a cold caller. To me, this was made clear from the get-go (although that wasn't the case for everyone; some people weren't specifically told they would be cold calling). Because of the nature of your job, it can be a bit defeating to say the least. You'll spend your day making around 200 calls, often speaking with people who have zero interest in hearing what you have to say. People will yell at you, hang up on you, tell you what a horrible person you are, etc. I suppose that this isn't exactly shocking news, since it is cold calling, but it can definitely take a toll on you after a while. If you worked at an actual enjoyable company, I can imagine that this would be less of an issue; but that's not the case here.
Another pitfall of the job is that your success is not a reflection of your effort. I noticed that others have commented on this on Glassdoor, and it's an important aspect to point out. Your success (or lack there of) is often out of your hands. Some associates will get placed into very accepting territories where people want to take meetings and are likely to answer their phones. Alternatively, other associates will be placed into territories where people simply do not answer their phones and are very unlikely to take meetings. You, as a BDA, have no say over which territory you're in. You could be in an "easier" one and make 6 meetings in a day, or be in a "tougher" one and make 4 in a week. Also, management will refuse to recognize this discrepancy (although it's crystal clear to everyone else).
The culture in the New York office is also quite toxic. Management is awful. I can't tell you how many uncomfortable things I've heard while there (racist, sexist, and just plain rude remarks and behavior). Not to mention the culture of staying very late. It was common for associates to be at the office until 8 or 9 at night. There was almost a stigma of leaving the office before 6 in the evening. And of course, staying late does not guarantee success (see above about territories).
Simply put, the environment in the NY office is toxic. I'm not the only one who thinks so, as within a few short months they lost nearly half of their employees. We were all sick of being in those soul-crushing surroundings with backwards and questionable methodologies.
If you are considering accepting a job at Hanover, I would strongly recommend rethinking your decision.