Pros
Mujin has been deploying tons of robotics system running 24/7 in real factory. There are various issues researcher/developer has never encountered in laboratory environment. Analyzing such problems every day helps us gain insight and learn what is important for realistic automation. Here, I could challenge such severe difficulties and develop many features introduced to genuinely valuable robotics system. Developers are well respected and operation side is careful of disturbing our concentration, thus we can work on development in efficient manner. Only necessary meetings are held (unlike many Japanese traditional companies). We can easily talk with leaders/CTO in person as they are close. I decided to leave here for different field I'm more interested in, however, if such new opportunity wouldn't come to me, I might want to stay for decades.
Cons
Mujin system is not a demonstration, but a real product. Whenever any issue happens, we need to solve as soon as possible, and as mentioned above, some systems are running 24/7, so, many employees have to be ready for issues anytime. (In different point of view, there are more chances to see and solve realistic problems!)