Pros
Open is a company of mostly engineers in a multitude of roles. Everyone I've worked with so far has been friendly, brilliant, and full of energy. I'd say Open does really fit the "family work environment" cliche, a lot of people have been working at the company for many years and are welcoming and helpful to newer employees. I've learned a ton during my time here, mostly from my coworkers. Everyone in the company kept their job and salary during the COVID pandemic, which I think is a good sign for the company's health.
Cons
The company culture is laid back, but objective focused. That means that there can be some intense spikes in the amount of work during "crunch time". The company managers that I've worked with, have always been respectful and appreciative of my time and effort, giving me compensation days rest when I've had to work extra hours.