Pros

The vision is great, it is on paper at least a global company, the products are cutting edge. Footprint is there in all the traditional industries, Dassault is present in all the major accounts of these traditional industries. Benefits are good, at least in head quarters in France. Travel is business class for trips over 4 hours, it is a wealthy company and it shows. Once you have a position, you can do pretty much what you want to do (at least as middle management level and above). With the right position, you get to travel all over the world and do a pretty interesting job. If you like technology, it is a good place to be.

Cons

There is absolutely no career management whatsoever. That is unless you are somehow related to someone at the right level at Dassault Aviation, Dassault Systemes or a major client. Since the company is after all not that big, it seriously limits the number of available positions. Culture is difficult to assimilate, and it is rare to have people hired with a good background (say at least 15 years experience) staying more than two years. Benefits are good in France but standard elsewhere, pay is below market. Company reorganizes each year, which does not give one the time to grow in a given position and prove their value. Also, it is easy to be out of favor and disappear in the crowd, examples abound.

Advice to Senior Management

Pay attention to your people, the number of disgruntled employees is rising all the time. Establish some kind of career management for everyone: since the vision is there with a multiyear plan and an idea of where we should be in xx years, you should be able to derive what we need in xx years in terms of skills and talents. Instead of hiring at the VP level all the time! You have great people inside, make them grow and believe again in the Company. Then you will find that we'll improve dramatically, create better products and sell them more.
And read "The No A**hole Rule: Building a Civilized Workplace and Surviving One That Isn't", then realize that there are many people fairly high up who kiss up and kick down. Get rid of them or (preferably) coach or retrain them.