Dressed in new yellow shell. Still useful unit of top portability and pleasing sound.

No doubt, I like the A17 too and I have used it on a transport duty as well. I just preferred the A35/A45 for transport duty because I have many DSD files.I don't think lack of DSD renders A17 obsolete. DSD is great but selection of available music is limited.
Anyhow, I had used A17 as a transport to send PCM signal to TA-ZH1ES to be upconverted to DSD 11.2mhz to listen to my library of FLACs. Not exactly the same as native DSD but still great and allows to enjoy a broader selection of music.
I have the A15 and the ZX300 (which has the same UI as the A55?). I prefer the A15 for its UI. I don’t like the touch screen controls of the new Walkmans.Which one would be the better option to get? A27 or A55?