tagging @ClieOS since he's the only guy I've seen here having any models from them.
also super interested in the Zeva Lord.E since he considers them TOTL, waiting for sales or more info on the MMCX version. might make a nice upgrade from my EBX.
ZEVA seems to be only interested in making earbuds with exceptionally good price/performance ratio and the SuperFire is one of such example. Sound signature is warmish tilting toward neutral. Good reach on both ends of the frequency response and a mildly sweet mid-range give it a fairly versatile sound that should go well most genre of music and the sound stage is pretty good as well. There is really no real weakness to speak of, especially considered it is a $15 earbuds.
Lord.E is a great earbud as well, but it is not the easiest to drive. You will want to use gears that of desktop level in order to make it shines.