Pros
The only positive is the name. Have Conde Nast on your resume and hiring managers will know that you've been to hell and back.
Cons
Conde Nast is not doing well anymore, and that's not a secret. I think the reason why they're doing so poorly is because the culture is completely outdated. Conde promotes a culture where people at the bottom are supposed to "fear" the people above them. I've seen people be yelled at and completely belittled. The work environment here is so unhealthy, and can turn even the most calm, laid back person into an anxious mess. There is no team mentality at Conde Nast. Most modern companies have an open, relaxed atmosphere where everyone is working towards the same goal. Not at Conde Nast. At Conde Nast the rich get richer and the poor get poorer. Those at the bottom work 12 hour days without overtime, and those at the top get bonuses, vacations, etc. The only reason to work at Conde Nast is for the name, and honestly, that's not even worth much anymore. There was a point in time when Conde was the place to be, and that's just not true anymore.