Since the halving these things are not earning very much at all.  I have 2 of them, one of them I got at under 3 BTC with a couple weeks to mine before the halving, and it still looks like it is going to be a long, long time before these ROI and that's without any electricity costs.  I have one underclocked and the other setup to underclock for 6 hours a day and then do stock clock for the other 18 hours.  Based on what others have said about failure rates this looks like a bigger gamble than I had anticipated. 

And what really sucks is that it comes on the heels of S7's that still haven't hit ROI with free electricity and decent resale price on two of them.  In about 2 months I should hit an overall break-even on the S7's since I still have an early batch unit mining at an average 5.02 Th/s but if not for the resale prices those things would have been a loss for sure.  Wondering if the S9's might be better sold at this point rather than gamble on them lasting long enough to get my BTC back.