Pros
Seriously the best company I've worked for so far. Everybody on my team is super encouraging, genuine, and bright. Leadership really takes care of its employees and makes an effort to recognize the work that everyone puts in. Sure, there are downsides, every company has them (especially marketing agencies). But I think the supportive culture really makes up for those drawbacks. The job is stimulating and LP works with a variety of different clients (some great, some not so great), so you'll always be on your feet. And if you're not enjoying what you're doing, they'll help in finding where you'll succeed within the company. It's nice to wake up in the morning not dreading going to work!
Cons
Pay grade can be lower than industry standards. Expensive benefits for what you get. I've also heard some horror stories coming from the sales building, but I've only been in back-office, so I'm far removed from them.