[ThePhysicist]

Same experience here: I did my PhD in France at a good research institute (CEA Saclay). The supervision was great as I was one of only three PhD students in a group of ten permanent researchers, so I could work with my supervisors every day. There was also a strong focus to keep within the three-year schedule, and a lot of opportunities to visit conferences and the like.

In addition, a PhD is highly valued by companies in Germany (where I live now), so your higher starting salary usually makes up for the low income during your PhD.

That said, doing a PhD for financial reasons is usually a bad idea. For me, a much better reason is that you can work on a deep (and interesting) problem for 3-5 years, becoming an expert in a given topic and training your gumption, which will help you to tackle difficult problems later in your life, even in unrelated fields. Compared to research work, most projects that you can do in industry are rather boring in comparison (there are exceptions of course). So, if you do a PhD, do it out of curiosity and not because of the title or the hope to make more money later.

[killaken2000]

Are you an American citizen and did you know the language before you went.

I would be interested to know what the process was to move from the US to France for a PhD.

[yodsanklai]

Research labs are very international so as long as you speak English you can do a PhD pretty much anywhere. It's also pretty easy to get a visa for a PhD or a postdoc. As for the process, basically you need to hold a master degree and find a professor/researcher with enough money to hire you. Labs often advertise PhD positions on their websites.

Finding a grant/supervisor is quite easy for a strong candidate. The critical part is too choose wisely the topic. Research tends to be very specialized and you may end up with a PhD that gives you few marketable skills.

[ThePhysicist]

I'm a German citizen, and I learned French in school, my level of proficiency was very low when I arrived though. Getting around using English was quite easy, and the application process was straightforward even with a German Diplom (M.Sc.). For an US degree you'll just have to make a translation and possibly have it's equivalence assessed, that shouldn't be too hard though. The UPMC (Paris VI) has a quite good PhD program for example, and is open to international students.