Remote voltage sensing of minor rails makes the best regulation ever seen on a kw PSU. As well as, of course, the perfect DC output quality similar to X series.
Seasonic's quality is top notch. I always check to see if power supply manufacturers are using Seasonic built power supplies, ie AX 750/850 from Corsair~
I always recommend Seasonic. When people buy something else I tell them they bought the recently restored Datsun Brat when I recommended the Bentley or the Maybach of power supplies. After that, they always buckle down and get the Seasonic. 100% Customer Satisfaction.