Pros
Free lunch and dinner - we just got a healthier caterer, so the food's now even higher-quality than it was before. Teammates - depending on which team you're on, you can spend your entire day working with brilliant, friendly people. The product - people at Quantcast joke that we all drank the Kool-Aid when we started, but we really do have an excellent product, and people at QC are genuinely excited about maintaining the quality of what we sell. Collaboration - QC has very little in the way of office politics. There will always be some, but the vast majority of people here have no interest in manipulating or stabbing you in the back in order to get ahead. We're all working towards the same goal, and most people you interact with will be highly supportive of you.
Cons
The re-org - it's been mentioned in other reviews, but there was recently a re-org of the entire sales/client operations side of the business, and it's gone terribly. There's a lot of bitterness and a lot of attrition, particularly from top performers. Attrition - in general, people stay at Quantcast an average of about two years, which means that we tend to cycle behaviors every two years as well, since nobody is around to remind us that we already tried something and either failed/didn't like it. Middle management - having a good manager can make or break your career at Quantcast. If you have a good manager, they will look out for your career growth, advocate for you, and help you find your passions. If you have a bad manager, you will have no idea how you're doing until you hit annual review, at which point it will be too late for you to make any changes that can affect your chances of a promotion or raise. Money - we're underpaid. The fact that we have catered food helps soften it, though. Workload - we're trying to scale while keeping headcount low, which means that everybody is stretched thin while we figure out how to become more efficient. This will probably last a while.