Pros
Benefits (PTO, health, etc.) are top-notch. I started right out of undergrad with 23 days of paid vacation time. Salaries are decent too, given that most of Unum's home offices are in small, less-expensive cities. People are generally very friendly. Unum is a team-oriented environment in which people are willing and eager to help you learn and grow. Not many ultra-competitive types who hog the spotlight to get ahead. Management is generally supportive of developing employees. Senior leadership doesn't just pay lip-service to this - they really mean it. Usually very accessible and down to earth. Interesting, varied work depending on which department you work in. Most of the time, work-life balance is great. Managers and leadership are committed to ensuring you get to use all of your PTO! Overall, Unum is a welcoming place to work. It's a large enough company (Fortune 500 with 9500 employees) that you can get a huge variety of work experiences and responsibilities, but it's not so large that you feel totally lost.
Cons
Unum is a large insurance company. It is not an exciting start-up and the culture tends to be quite conservative, which can rub some people the wrong way. Decisions are driven overwhelmingly by consensus, which can be a good thing, but can also slow down the process. There is a culture of hesitance around speaking up, whether it be to raise new ideas or raise concerns about ethics / workplace issues. Some departments (e.g. HR) have suffered from significant reorganizations/cuts in recent years and performance has suffered as a result. Proprietary technology platforms are mostly old and cumbersome. Certain times of year (e.g. year/quarter end), you can push 60 hours/week.