I am still trying for my first China. Mongolia, no problem.
There is fairly regular activity from these two, and bursts of activity around contests, etc.
What I have found frustrating with Chinese stations, is that often they have a good signal, but don't hear at all well. I'm sure you've read about the air pollution, water contamination and dodgy food supplies. I guess that applies to RF pollution of the highest order too.
I think it goes without saying, that you must have CW skills to complete your DX toolbox, and be ready to use digital modes, or even resort to SSB!
73 es GL,