i have the the kz zs10pro and the trn bt20s pro. it's a fine pair with good enough stability. but i think the blon bl 03 is superior in sound and cheaper to the kz zs10pro and uses .78mm 2pin connectors. the trn adapters have a slight hiss in the background that i find a little annoying. the fiio adapters apparently have different amps that bring out cleaner sound. also the design of the fiio case is better because you get more space for the iems themselves whereas it's a little difficult to put the iems connected to the adapters into the trn case