Pros
Great atmosphere, friendly coworkers, generally a fun place to work if you're interested in a career in sales. The CEO is such a nice guy, and really believes in the work that everyone's doing.
Cons
Interviewer will not tell you this is a telesales job. The 'hard work' here is performative in nature--telesales. They'll tell you it's a 'numbers game' at the beginning, until you 'build your network.' Going into the position, you'll have no idea what any of that means, because management is so wishy-washy during interview process. They sell you on the job. It can be a little high-school, and the office politics are sometimes confounded by the 'we work at a startup' mentality. If you're looking for an intellectually stimulating experience, run. It can feel like you're spending your day not doing anything meaningful when you've dialed your requisite amount of phone numbers and not a single person answered the phone. It's a great idea, but not for everyone. Don't let the zeal of working at a startup keep you from understanding where you'll be and what you'll be doing.