Pros
Whenever I've heard colleagues talk about why they enjoy working at Towers Watson they've always mentioned their colleagues and I would agree. The people here really are what make Towers Watson a fantastic working environment; despite the diversity of backgrounds people come from, they all share a commitment to collaboration and excellence so it is a very supportive environment which pushes and enables you to be the best you can be. I have worked for Towers Watson for 8 years and have had career growth and development I couldn't have foreseen - every time I've been ready for a new challenge one has come along, often from an unexpected direction. Despite the fact that it's a global multinational, leaders are very accessible, it's very non-hierarchical and there are surprisingly good connections across geographies and lines of business so it feels much less intimidating and more navigable than other global professional services firms I've had exposure to.
Cons
Towers Watson is an 'adult' environment. Opportunities, support, development etc are plentiful but you have to use your initiaitive to take advantage of what is available. People who like to be spoon-fed may be less well suited. Also TW offers a total career/reward proposition so, while the dollars are by no means bad, people who are heavily money-motivated will find other environments in which they'll be able to earn more.