I have both actually, and use them for different scenarios. The V30 is like a DAP, even thinner and lighter but still a bit of a bulk. The ES100 is perfect for smaller pockets and summer clothes, or for the gym sometimes, a really tiny and feather-light device. I definitely wouldn’t rate the ES100 higher than a DFR, but it’s close, just like it’s close to the V30 - very close, though differing in signature. Haven’t heard the Sabaj. Even for people with the V30 the ES100 is a great accessory that caters to other use cases and gives a lot of control over the audio through Radsone’s brilliant, feature-rich app.