I have owned my Bluboo Maya Max for about 2 weeks now and I am extremely happy that I decided to buy it I love it more and more each day, it is the best phone I have ever owned! Music quality is fantastic, I think I enjoy it more than my Ipod background instruments in particular sound more refined to me. The first time I listened through iems (kz ed9s) I genuinely had a smile of my face and boy is it loud! The loudest volume setting is almost too loud listening through iems and the speaker freaking cranks. Listening to music through neutron is amazing, I am so glad I took the risk buying it and considering the fact I only spent $99 and it's specs I feel as tho I almost stole it lol.
In my opinion I think the DAC manufacturer NXP could be the real deal and the best part is they are supplying their DAC to several Chinese manufacturers so there should be quite a lot of options when it comes to phones using their chips for those that are wanting budget phones with hifi audio. I'm sure someone else with more refined hearing that me would probably with some flaws with it but to my ears music sounds fantastic.
I look forward to using this phone for years to come and the best part is I can finally get rid of my ipod!