Only way to know the truth about bass or QC is being able to compare both pair. I don't know if fake Takstar exist too....what I know its that I pay mine 60$ and that they have more bass than Audio Technica M50 as well as all Superlux I own. First I prefer the ISK HF-2010 over them but now its different, mids are better with PRO82, only thing where 2010 beat them is in soundstage (open back).
And for selled ass hyping, i'm the witchs hunters of those....don't think any of the reviews I read are one of them (have a black list of some savvy reviewers or hypers)
I don't own M50, but I do have the HD668B and the HD681 EVO, and the Pro 82 I have (bought second hand, so I don't know which variant it is) definitely have less bass than the HD 681 EVO for sure... it's not even close. On the other hand, they are extraordinarily comfortable and quite clean sounding to my ears.