Pros
Relocation package. They promise many different career options and they claim that they would assist you in your personal development (career development) path. Friendly atmosphere and teambuilding events. Work is not strictly organized and easygoing, no focus on pushing every last bit of productivity from individuals. This may also be seen as a con by highly competitive individuals.
Cons
Many of promises are unfulfilled or subpar. They promise to teach you French, but only pay for a short course that is definitely not enough and in my opinion not beginner friendly. Work type options are severely limited for people who don't speak French. And they don't express this fact clearly during interviews. They tell you that speaking French is desired, but not necessary, and that they will help you to learn it within a few years. In my example, I was put into a team doing the work that I didn't like at all. They had no clear newcomer introduction or mentorship process. Project was extremely complicated, code very hard to understand and nobody took the time to help me understand it enough to be able to work efficiently. They gave me (an inexperienced beginner) a task that experts were unable to complete years before. I was loosing motivation and was unhappy with the state of project and my work. I expressed my dissatisfaction multiple times, but they didn't really find any way to solve the issue. And there were no better options for me available, that would match my desires. Eventually I decided to resign. They do business with independent relocation service, which is suboptimal. And they don't really strive to offer the best possible service in this regard. In the beginning, an individual responsible for my relocation was very helpful and explained to me all that I asked, including about life in France. But eventually answers got more scare and delayed. I had not been given the detailed information with pros and cons for apartment options. I was rushed to quickly pick one, so they wouldn't need to look at to many of them. Post-relocation support was bad, with 1 month hard limit.