Pros
With the growth the company is undergoing, there will be continual growth/promotional opportunities for the next decade. The general public's confidence in making online purchases will only increase as the "Text" generation graduates from college and has access to disposable income.
Cons
You will definitely work hard. If you don't like what you do, or who you work with, it will be a struggle. But if you enjoy your work, and those you work with, it could possibly be the coolest experience you ever have. Plan on being accessible via email at night and on weekends. Unless your a Software Development Engineer, you won't be on your computer over the weekend but a couple of times a year. You will be asked questions via email that may require a ready reply. Depending on your responsibilities this could be 1-2x/week to daily for high mainenance roles.