Pros
The company is ridiculously fast-paced. When people talk about the growth rate/speed of development and work, it might seem exaggerating but it's not. A lot of the employees are from top-tier schools and the company has a very young crowd atmosphere. Descent free food, snacks, ping-pong table,billiards etc. Managers are very open about your development and progress and you will learn so much within a year than you would in 3/4 years in most places. The merger with Acxiom personally makes me feel comfortable as you have a godfather like presence looking at what you are doing and making sure everything goes according to plan Remote working (as long as you do your work) is encouraged.
Cons
It is a very typical "startup" culture where the word 'cool' gets thrown around a lot. So if you are the kind of person who wants to do everything methodically, this might not be the right place. Not a big fan unlimited fan of unlimited days off. The old-school fixed 15-20 days/annually would be much better.