I don't trust Chinese reviewers like i don't trust reviewers from Singapore.
I know a few audiophile from China and Singapore and for them, more expensive is always better, no question what. The more expensive an product is, the better it sounds.
Especially in countries where the majority of people is poor, if you're rich enough to purchase such products, it is a status symbol and so the more expensive it is, the better it has to be.
To my experience (and yes, i know, oversimplification), they will always tell that the more expensive gear is the better gear. "It does have more power but sounds the same" would be not acceptable to them.
There are sometimes even conflicts where they start arguing with the people who developed and made the device because they don't accept whatever they think they are able to hear.
I remember some interviews from the Sony Team (sadly i no longer remember the country, i think it was singapore) where people in the audience started arguing with the leader of the Walkman team about things they think they are able to hear and the leader from the Walkman team just said "We are sorry to tell you, that these differences don't exist. There are differences in other sectors, but not in the ones you mentioned". I think it was about changing the region code on the WM1Z but i'm not totally sure anymore. I just found it funny that people in the audience argue with the Developer of the device, as if he didn't knew what he made and needs to be told.
And still there are people who insist and are 100% sure that every country gets its own sound signature and depending on the region code you set the device to, the sound is different.
I know that THX Certified devices do need to have the specific THX Sound, that is why THX sells the Amp as a Module and not a single Chip and you have to implement it exactly the way THX tells you too.
So they will always sound the same, that is the whole reason behind the certification system. That you know "I will always get the best sound when an device says THX Certified, no matter which brand or product type".
I am pretty sure that FiiO is legally not allowed to have a different sound on the M17 and they don't want to. THX AAA Amps provide the highest sound quality that exists right now, why should they even think about changing them just because it is not to the personal taste of some people?
FiiO does never at any place advertise the M17 as having the better sound. Their advertisement is totally focused on how much power it outputs and that it is able to replace an Desktop Amp.
And i think this is exactly the reason to buy an M17 and the difference to the M11 Plus LTD. 3000mW vs. 588mW.
You need 3000mW? You need M17. You don't need 3000mW? You don't need M17.
The M17 will have perfect sound quality, exactly like the M11 Plus LTD already does have perfect sound quality. Buy the M15 or other brands if you want something that is different.