I'm trying to collate some thoughts on Defiant, but overall I am blown away by it. I didn't expect two products from the same company to be the best purchases I've made in audio, the APWS being the first and the Defiant the second.
On the Defiant, the power lifts the low end on the APWS, resolving the main issue I had with it not covering low strings adequately (amendment to the review to come). It is an absolute beast with my IEMs, especially DD, planar or EST hybrids that require power. It has a very black background and dynamics that are off the Richter scale. When I paired the Cayin C9 with my IEMs I was impressed to begin with but the novelty quickly wore off and the improvement in sound wasn't worth carrying the device around. Now, going back and forth between Defiant and DX300 Amp12 I wouldn't want to listen to my IEMs any other way.
I'll probably write a deeper dive on the Defiant when I get the time and that may include the Defiant Docking Bay attachment if I buy it. In the meantime, here's a picture: