I've been a chief pilot and I'm still not impressed with training bonds. Aviation is the most mobile of careers--just move and force them to find you, then serve you, then collect. Mind you, I don't think it's honorable, but reality is they can be hard to rnforce, IF you sign in the first place. They may find it tough to get enough pilots to sign on, let alone enforce it. B787 guys are in demand, enforcing a bond in China would be very difficult.
GF