Pros
Mostly Serious's work culture is authentic (not ping pong table, beer-in-the-break room stuff) and genuinely emphasizes team members' work-life balance and tenure. It's very easy to communicate freely and openly here and be heard. The opportunities for growth are vast. Each team member is valued. "Fast-paced" agencies can be toxic, but while Mostly Serious does move along at a fast clip, it is not the kind of agency that asks too much of team members or uses them. I also genuinely feel like though Mostly Serious is ever-evolving, it is always currently operating as its best version.
Cons
Mostly Serious generally does not micromanage and expectations are very high for personal accountability. People who excel as self-managers thrive here while people who perform better with more hands-on management or reminders tend to struggle. Mostly Serious offers a lot of freedom to its team members, but team members are expected to use that freedom to prioritize their own tasks and be responsible for their deadlines. That level of accountability just isn't for everyone.