The pass rate is low unfortunately for all three events you have to pass. The written ATP you just have to study. The medical never gets any easier or less stupid, every 6 months.

I haven't heard much bad about CS. To me that means it must be OK. Happy people don't get on internet forums and proclaim their happiness. Just the unhappy get on and complain. No complaints - must not be a bad gig. Guangzhou is one of the best, most westernized cities in China. I was based there for a year.

Good luck with your job search.