I have exactly the same problem like you !...
and i believe they dont expect return customers !...
Really glad it's not just me. I was a repeat customer

Asked if it was possible to pay a reasonable premium to receive a unit that does closer to 1THs, and the response I received was "we will select one our must stable machines" (Note: did not pay a premium, paid the same as everyone else)
*sigh*
Caveat Emptor I guess
