Im based in the UK so might not have access to this. Why would I run this over 2 750w?
Server power supplies are designed to run at near-100% load for extended periods of time, and usually rated for 90%+ efficiency. They're built like tanks but some of them do run somewhat loud. Server power supplies are always my first choice for mining. They're also slightly cheaper most of the time.
With server psus, you also have more flexibility with connectors. It's not hard to attach a few cables you need onto a breakout board or solder them on.
That's interesting I think il look into this for my next build.