If you are a Captain at Cathay/Dragon don't come to China and in most cases the FO jobs are very painful here. There are a few airlines which do use ExPat Instructors quite extensively but most are private airlines and newer airlines. The widebody jobs are in many cases Cruise Captain jobs especially on the Boeing fleets but A-330 fleets are better at being the PIC. The only advantage I can see is you may take home more money in your pocket. The 15% HK tax, the high cost of housing and living expenses make Mainland more attractive but in my opinion not attractive enough for a Cathay Captain who has 20+ years invested to give it up and work in the mainland. If you are an FO who has 500 hours PIC on an A-320 or B-737 then it is probably a good move but don't expect it to last as a career. Come here for six years make the big bucks and then move on to a retirement job.