Everyone which has done some research into bitcoin mining knows the ButterFly labs company.
The company which charges their clients in advance in order to provide hardware months later.
The clients complained that the hardware was delivered very late and that it often was damaged. Forbes has written a massive report on the ButterFly labs affairs, and it is worth a read.
The report claims that the founder of ButterFly labs was involved in email scam frauds and that he had been convicted. PayPal stated that they had received 6000 reports on ButterFly labs.