holden4th
500+ Head-Fier
I used Auvios for a while and they were my go to for my IE80s. The Spinfits blow them out of the water. The SDs give good isolation and possibly a better bass but are more prone to sibilance thought I've only tested them out with my small range of iems which include the IE80s and the wonderful Flare R2As. The Spinfits are in a class of their own in most circumstances.