Just got this to replace a Soundblaster E5 whose battery crapped out after 1.5 years of light usage. Regularly $98-ish. Using it now with Beyerdynamic DT880 600 ohm. Haven’t done A/B blind testing with anything but so far so good. I bought mine before the code came out, so it cost me $83 shipped.
https://www.monoprice.c