These guys will take your bitcoin, and then weeks later tell you that you need to purchase more because your product came in "batches" that can't be separated.
They stole $15,000 from me.
I found many other people that have had the same experience.
If you follow the transaction on the block chain, they immediately scatter your bitcoin through hundreds of addresses to throw you off the scent.
Do not give them your money.
I brought 11 miners from here the service they provide is great which really helped me out in crypto mining.