I did research on crypterra and I really believe they are legit, just look at their mining wallet balance:

https://blockchain.info/address/1N52wHoVR79PMDishab2XmRHsbekCdGquK

I got their Xmas sale of 340 MH/s of ETH for $1912, which is a deal that cannot be beat these days. I am getting paid everyday.

Check it out yourself

https://crypterra.net