I can't say. The one with the most burn-in and "head time" is at my office, but that one is the one that did NOT come from Takstar, rather shipped loose in a carton from another Aliexpress seller. That unit, however, has absolutely nothing wrong with it, and it is that unit that ultimately made me decide to purchase a "second wave" of Pro 82s.
Of the 2 other units here at home, both are from TakStar directly, and while I've given them brief listens to make sure they worked properly before confirming delivery, I've not listened to them extensively, and probably won't for some time. Based on brief listens and physical examination, nothing about either of those units leads me to believe that something might be amiss.
Headphone like/dislike, as well as characteristics, are a very subjective and personal thing, not to mention each person's aural sensitivity. What sounds like heaven to one person's ears, may sound like unmitigated crapola to someone else. For example, being over the age of 50, I know that there are treble frequencies I just can't hear, so I may not be as susceptiible to treble harshness in the uppermost frequencies (or able to glean nuance for that matter).