I've never heard the ear studio es100, but from I have read there would be no comparison. The aptX, balanced output, app, EQ, built in amp, etc. No contest. I specifically mentioned the BT20 because it classifies as TW, unlike the other TRN bluetooth cables (of which there are loads of Bluetooth cables from many manufacturers). The BT20 is unique in that it is a TW adapter that has a removable interface that allows one to connect a multitude of IEMs. I really hope we see other competitors come out with a similar product. However, it is not perfect and I have my own complaints about the BT20. But then again, nothing is perfect.