Pros
Amazing science, large number of extremely bright and entertaining colleagues, lots of good food in the fridge. Some team leads are awesome.
Cons
Playing Russian roulette with your career and your sanity by being part of something akin to a circus, with intentionally destructive "management" behaviours and unsteady direction. As a new starter, your life expectancy in this firing range will be about a year, sometimes much less. Unless you fancy extreme sports with self-destructive overtones, consider chosing another employer or you will find yourself in a cycle of pathological lying targeting employees, customers and possibly investors too. Denial culture is rife. "Company culture" is used as a codename for hunting any signs of non-conformance with radical notions leaning on the far side of the ideological spectrum, in an uncanny reminder of contemporary UK politics. In summary, even in light of the positive aspects (there are many and are not limited to the free food), the risk/benefit ratio is strikingly poor. If you do get lucky, the experience will prove very rewarding, always at a high cost.