Bitmain is very famous for mining with their ASICS for a few months and then later on selling it to their customers. Many people observed this when they would dust inside their miner which Bitmain claimed was simply “dust” season in the factory it was built.

Right now their issue is with the China crackdown. So most likely it will be a while until you will be able to order one and mine with it.  Most likely by the time you pay and the time you receive it, the difficulty will grow a large bunch. Buy it if you wish but just know the risks.