Pros
It was a steady paycheck.
Cons
As a former U.S. employee it was very clear that Bernard Charles and the management team in Velizy are concerned with one thing: revenue. Employee happiness and job satisfaction are at best a distant afterthought. At no point during my employ at a DS subsidiary did I ever feel that Dassault cared about me as an employee, or that my contributions were valued, and decision after decision handed down from corporate reinforced that. Any semblance of office culture or employee perk was slowly snuffed out as our company was integrated post-acquisition. Dassault has acquired some wonderful products. SolidWorks, is a great example. However it insists on tying those products together via "The 3DEXPERIENCE Platform", a web portal that is so embarrassingly slow, clunky, and dated that it's amazing Sales is ever able to sell customers on the associated (and actually good) software. If you're considering employment at Dassault or a portfolio company, do your research.