I don't know if Cities have anything to do with getting lousy or good service, but at the beginning we send Flat-rate Box of stuff and they always arrived in about 10-12 days time. We also put Insurance on them each time for what it's worth.
The last couple, I use one of our Boxes and Qing writes the address in both Chinese and English on them.. took same 10-12 days. Now though, the last one.. there was over $1,000 worth of clothes in the box and we Insured it equally. The trouble with that one, the Chinese Post Office opened it and called Qing's brother and told him... he owes $50 import tax before they give it free. So to overcome this, brother asks to keep the price of items never more than $300. That forces us to keep the insurance low too.. otherwise it smells fishy. That's OK on my side, we just go with brothers wishes. He'll take the chance, especially looking to buy $1,000+ leather jackets and such.