Just some correction tips:
Mango OS is iBasso's custom Linux-based operating system (OS), which is not featured on the DX170. What it does have is Mango App, which is a music player application.
What may confuse the reader is that you state that the DX170 is not strictly neutral as a con, but in the sound performance section, you describe it as "quite neutral and very transparent" and "mostly balanced". Therefore, it would be greatly appreciated if you clarified what you mean in the cons section.

Aside from that, very nice job on the comparison section!

Thank you very much, you are right I should do some refinement but bare with me since English is not my speaking language.
Not strictly neutral because of the upper mid focus.
Regarding the Mango player I wrongly used the word OS.
Now I have corrected everything.

@Ichos I assumed that it's the language barrier. I myself am not a native speaker, so mistakes happen =)
Am always here to help people out! Glad you fixed everything.

The review is quite extended, too many words, so even I have read it several times there are still mistakes to be found!

Great review