I strongly disagree with this statement as I own over 25 Bitmain PSU's and they are spot on. Whether 240v or 120v, they simply work. Granted I love the Parallel Mining Delta for dual D3's and triple L3's. The APW is still one of the best, easiest, and most affordable for the T9/S9 series.
Scrapp'
I'm not saying they don't work. I'm saying some s9's don't work with them and if anyone has any that have doa hashboards when you get them try using a non bitmain PSU. I have fixed 2 s9's this way and have read of others fixing them this way also. I have quite a few machines running the bitmain PSU's with no problem also.