Cryptoboreas has GREAT service and reliability and the cheapest rates in North America...but ALL S9's are now mining at a loss.
My S9's have not even reached roi nearing their second birthday. they will be taken offline very soon.
They performed rather well actually out of 27 S9's with 81 boards I only had 8 boards and two controllers and 2 fans die on me...10% failure rate over 20 months.