Pros
Lots of latitude to put your stamp on a new company. Diverse workforce with experience from across the entire semiconductor industry. Innovation is encouraged Lots of growth opportunity for both company and employee
Cons
There are few systems in place. Doing what should be a simple task (like measuring wafers) may turn into a scavenger hunt as you track down the one shaman who knows the tricks to do what you want to do. Lots of turmoil at upper management levels contributes to a sense of chaos throughout the company. Changing missions/roadmaps at the sites leads to confusion and waste in planning and executing a factory startup. It's hard to be successful when you change the requirements for your factory in the middle of a startup (28nm to 32nm to 20nm....).