Not a reason to discount his opinions, and so far from his reviews I trust his character… but he gets free IEMs from Penon and this is one of them.
Mine was gifted to me too, by an individual.
The result is the same - whether it’s good value for $600 has to be taken with an absolutely massive grain of salt in anything I, he, or anyone else who got them for free, writes.
Beyond that particular caveat, I agree that he’s written a very detailed review, even the pros and cons list is exhaustive. He has a lot of IEMs from similar brackets to make comparisons against which is very helpful for folks.
If those were for free too then the relative value of IEMs in his experience might still be skewed, not having had to put that much spending money on the line before enjoying the sounds.
But like I said from different reviews he’s written I personally give him the benefit of the doubt that he isn’t putting any deliberate bias into what he writes /has honest motives.
Edit: Going through the pricey comparisons, Penon Turbo ($550) was sent to him free, BGVP DM9 ($630) was sent to him free, Kinera Skuld ($550) not mentioned if bought or free. My point is that even an honest well meaning person can’t provide a reliable gauge of value if the comparisons are between hypothetical pricetags, not actually having to sacrifice that amount in order to listen and say “hey these are nice”.
To reiterate free samples don’t negate an individuals insights to the sound, and manufacturer samples are a key way reviewers can review as many models as they do, but it’s hard to say they don’t cloud our opinion of “worth the money” or not.
Edit: Not to discredit the validity of his impressions, but again context is important when reading reviews and making buying decisions:
It’s hard to find a review of his that isn’t 4, 4.5, or 5 stars. It could be he only reviews what he likes, but also, it could be that he is just more optimistic than the average listener and appreciates a very broad range of sound profiles. From his Penon Dome review: “Ive review tremendous amount of their IEMs, loving about 90% of them.” At least personally that makes it hard for me to track his preferences to be able to interpolate his impressions for how my ear might hear them.