Pros
They adhere vigilantly to Scrum. They aspire to change the world for the better. They have the highest possible ideals. Very few levels of management so you can more easily have a big impact if you are at the top of your field. They are genuinely offering a great product and aspire to reduce its price to be truly affordable. They revolutionize constantly.
Cons
They have a deeply cliquish culture - from the top down. There are resentments between departments. The sheer number of meetings to attend for ALL their Scrum objectives and to meet ALL their high ideals is overwhelming and sacrifices much productivity. They are extremely social - a constant barrage of communication on Slack via a multitude of channels plus emails, and many other platforms. For engineers, they subscribe to the ideal of breaking tickets into the smallest possible unit - but unfortunately they have a time-consuming release process and a culture of everyone giving tons of idealistic feedback on pull requests. The overall effect is that you spend a lot of time just tracking your PR's through the release process, making several changes because teammates want the code to be perfect. Often the scrum team will take over your tickets in an effort to "swarm" - which means if there is anyone on your team more confidant, more knowledgeable on the codebase or just more popular, you can easily have your assignments taken away by the team, even if you are part way in and are enjoying it and want to see it through. The scrum teams are made up of 5-6 people, with a Product owner, QA engineer, front and backend engineers - which means that you will be working closely with only 1-3 other people - which can be very bad if these 1-3 individuals assigned on your team do not have good interpersonal skills or are super ambitious - it is already a cliquish culture. These things combined easily makes for a very troublesome and miserable work culture and daily experience. This is simply not likely to be a good environment for most junior or intermediate engineers. If you already know people on the inside and can immediately be accepted in their clique, then it might be workable. Additionally, this is a very horizontal type of company - not many levels of management are above you. The downside of this is that there are very few opportunities for promotion. They fire people very frequently - whether they have been there for a week or years. It makes for a nervous culture - never know for sure when/if you will get the ax - they stay super agile and err on the side of cutting off their nose to spite their face.