actually, those grade"A" xiaomi is also similar in term in performance with the so called original xiaomi selling from the website. this is because those factories in china is producing more than what xiaomi ordered and these products will go to third party.

I have "a" grade yoobao and a ori yoobao and I cannot tell the difference between the a grade and ori yoobao in terms of performance.. only there is some difference between the cosmetic whereby the a grade is less polished.