I brought some clones. First batch - 6 months ago - was of top quality, in my opinion. Second one was terrible - I fought one hour to align the pins. I am not sure about electric diagram. I shall see in the coming days.
I need some decent quality boards, I do not have the time to tinker and explore. Some people here say Nano is going to be discontinued. I suspect this will affect the availability of the clones as well.