Pros
The company has a good name in the industry, above average paid vacation/holiday time with Friday summer hours, many office locations/company openness to working remotely (manager and job-dependent, of course), plenty of intelligent, friendly people work here, people generally and genuinely get along well, not a company environment where people step on other people to climb up the ladder.
Cons
Comparatively low salaries, low bonuses/lack of bonus structure, below average equipment/IT, health insurance is getting worse and worse (probably a general trend, but Ipsos has been switching insurance companies every year for worsening policies, I suspect for lower costs to the company). Also, no cohesion across the company verticals, no cohesion across geographies within verticals. Worst of all, still doing things the old fashioned way in terms of manually doing repetitive, tedious tasks; no attempt to change that from above, mid-, or below (no encouragement nor resources to do so). Did I mention the long hours? -- this as a result of lack of modernization.