I picked up a couple of the Alpha Miner APW9 replacement PSUs, just did a comparison with a Bitmain APW9 and it looks great. It's a bit quieter and in my test case used 40W less power (2265W vs 2305W) in identical conditions.
We'll have to wait and see if it is reliable, but I doubt it will be worse than Bitmain's...
Also has a wider voltage operating range, 200-280.