Pros
The pay, benefits, and perks are generally above market norms and likely the main reasons why people come here and hang around until they inevitably leave. There are good growth opportunities within the company as long as you actively seek them out and fit into a particular swim lane. There is an extreme amount of crossfunctional collaboration so you get to wear many hats, but a lot of this is due to the lack of structure. The pace is frantic but you'll learn how to juggle a lot of things at once and execute (not without lots of frustration though). The company is generally in a strong position in its markets. It's not as terrible as some of the reviews on here make it out to be, but do your research and know what you want to get out of it before going in - for most people this is to get in, get paid, get promoted, then get out after a few years. This is not a place to just "try out".
Cons
There is a sense of urgency for urgency's sake - the company justifies this by hiding behind the M.O. of "we're the multibillion dollar startup" which really just suggests they haven't figured out how to scale properly. Frequent knee-jerk reactions to what the executives say lead to constant project pivoting and a "throw darts at the board" design approach. The hierarchy is a paper exercise with pretty much every little decision coming down to whatever the VPs or execs want. Retention is bad - most people are on the "2 to 4 year plan" and HR is notoriously bad at the hiring process (intermittent communication with candidates, setting up interviews for the wrong position etc). The reporting structure is fragile at best with most people going through 1-2 managers per year either due to re-orgs that don't stick or people leaving - this leads to a total lack of accountability with no review process to speak of. There can be title inflation - there are more VPs than I've ever seen at a company, and by that point they are usually just playing the game to stay at the company, say yes to the execs, and collect a nice paycheck. In short: everything you need to know about the company is summed up by the building layout - the entire company is on one ground-level floor except for the President and the CEO who are on their own floor one level above.