This is one of the reasons I like the Mini-X. It uses a pretty good heavy duty power supply and a very large toroidal transformer it also has a fully discrete design.
Listen, for $200 it's a steal for a starter amp for the HE-6. Better than the majority of headphone amps "For the HE-6" that use those small ass r-core transformers.
Lets not forget Emotiva sales direct to the public with no middle man. If a reseller was involved to make a profit they would sale for $300 or more. Hell as many sales Emotiva has you can get the amp for $175.
Not saying it's better than "X", It's not the best out there by far. However, to start out with before upgrading or as a stand in until you get the amp of your dreams. It's great at it's price tag.