I do not remember all so well...been 3 or 4 years since then. But ROI was not that fantastic, in general they mined to me about ~1,5-1,7 times more BTC than I have paid for them (measured all in BTC, until it became full non-profitable, below the electricity cost). Shipping was dealyed much, and 1 month late in starting was making a huge huge reduction to ROI ( due to a very fast difficulty increase) Hence - my warnings.