I'm in the same situation as you guys. I also ordered in Feb for March delivery date I've been told now before the end of August. Recieved a compensation miner which at 837 mhz keeps an average of 630ghs.it will do 800 plus but AVERAGE which is the most important over time is as stated earlier. Anything over 837mhz and the hash rate drops. I'm hoping the other miners when they come through perform better.