Pros
There is a lot of really cool technology to learn and play with every day. You will literally step over or around robots in the halls everyday. The work life balance is great, and you will be rewarded for getting results regardless of the number of hours you work. The engineers are extremely sharp and hardworking. There are great career advancement opportunities, and iRobot strives to promote from within and train its workforce. In my time there I went from associate to principal engineer, then into engineering management. I cannot say enough great things about what iRobot has done to provide me with career development opportunities.
Cons
There is a very odd engineering management dynamic. Many engineering leaders are not competent in the core areas of iRobot products and are disconnected from product / program teams. In the last few years, software has become more important to iRobot, but the management team has not been able to keep up with the trend. Only 1 or 2 program managers are actually interested in engaging their software team members and many competency managers seem unable or uninterested in working on programs. It creates a lot of unnecessary confusion and frustration for the people working on these teams.