Bitcoin mining was always my dream but back then I couldn't afford ASIC miners and I was mining altcoins with GPUs, which was nice but today it's not as profitable as it was years ago.
Finally, I have some money to buy a Bitcoin ASIC miner from Bitmain but I also have one fear for years. What if I receive a damaged ASIC miner? It takes months to receive them for China, it will take months to return them back to China and it will take some months to then receive them back again from China.

How do you risk buying ASIC miners from Bitmain? How often are their products damaged? Does it worth the risk to buy miners from them? How good is their support?