I'm looking for a DAP and would be interested in seeing some test results and listening impressions.
I'm currently using an Audioquest Dragonfly Black with my phone, playing uncompressed WAV files bit-perfect via USB Audio Player PRO:
https://play.google.com/store/apps/details?id=com.extreamsd.usbaudioplayerpro&hl=en_GB, but I don't like the fact that it is a dongle hanging off a short USB cable.
It's nowhere near as good as my home set up, an RME ADI-DAC together with JRiver Media player:
https://jriver.com/ and all my music stored on a PC as uncompressed WAV files, but it's not bad and certainly acceptable to me for non critical, on the go, listening.
I did try a Sony NW-A45:
https://amazon.co.uk/gp/product/B0798LBBJW/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1, physically it's a neat little unit, but sonically it was very dissappointing, the sound was totally flat and lifeless with absolutely no oomph. I tried messing with some settings, but to no avail, nothing really improved matters. It also didn't go very loud, which didn't help things - definitely one to avoid.