Pros
You will learn. A lot. This company has some of the most challenging, most exciting, most technologically engaging problems I have ever had to solve, and I learned an amazing amount in the time I was there. You will find something in their culture to value. The principles of leadership are impressive, and the way they interplay with each other actually informs how the company operates.
Kontras
Your employment will be a blessing or a condemnation depending almost entirely on the team for which you work. I was in Builder Tools on the deployment engine team, and in two-and-a-half years my life was hell. I was forever understaffed, overworked, and unsupported. My manager provided no coaching, no guidance, and no support except on performance "reviews" which were almost entirely full of new information. He was forced out of management, but not before ruining my chances of keeping my job. When I brought the matter up to HR and said I was being unfairly treated, their direct answer was, and I quote, "if we did something about this, we'd set a precedent of letting employees dispute their reviews, and then we couldn't manage." After that, I had no interest in fighting for my job, since it was clear the company had no interest in fighting for me.