Hello, qingqin! I participated in this program last year. I find this program very good if you want to save some of your money and order a good range of items with one purchase. One problem I met was the delivery speed and the package tracking. I chose Hermes as my delivery provider. The thing is that Hermes announcement services didn't work correctly, and I never received any mail about my package delivery status. Hopefully, I found this tracking site Post Sendungsverfolgung.