Pros
Profitable company. Things move fast. You can see your code changes in production in no time. Looks good on resume. Cubes have a nice view if you get a lucky seat. Some, not all, of the technology is cool.
Cons
Obsessively driven co-workers with no lives. You will be expected to work 45-50 hrs a week just to keep up. October to Dec 25 is treated as crunch time because of the holidays. Mandatory Oncall from 1 of every 4 weeks to 1 of every 8 if you are lucky. Developers are 30% tech support for their service, 40% business analyst and 30% developer. You will spend far more time learning the intricacies of shipping boxes through UPS than working on "cool" things and you will be expected to feel passionately about those boxes. Standard "lean" process speeches from senior management over and over. Priorities change at the last minute. Chaotic undirected environment with everyone competing for air time. You have to learn a thousand buggy in-house made tools You will be a cog in the machine. Squeak and you will be replaced by a new college grad. There is a reason nearly everyone there is under 30, think about it.