yup, i think an easier way to select gain, a switch or dial perhaps, and a input selector, both on the front panel, is the first thing they should look for, it's so flexible yet such a pain to change settings, i often switch from rca to xlr, and setting the gain when going from iems to hd800 or lcd, fix usability !!!!!!
sound quality wise i would change nothing, maybe price it a little better
maybe ditch any unnecessary luxury