-there's a particular way of teaching or doing things, so training period could be quite intensive. But the team is encouraged to help one another and there's a team of team leaders to answer your questions.
-you might receive complaints from the learners sometimes, especially if you are not familiar with the culture. The thing is you should be careful what to discuss with the learner. Stick to general subjects and avoid personal ones. We have support documents, so you'll be fine if you diligently follow the support.
-somewhat unsociable working hours. I am based outside France and we have a huge time difference. It's sometimes hard to communicate to your colleagues in person as you have different shifts. Also there's a possibility of receiving late responses from France office.