The short story is that HE5XX was released, a few FR measurements were dropped, and then suddenly it seemed that almost everyone assumed that the HE5XX was a reskin of the Deva and got their panties in a twist. How dare Drop reskin a Deva and call it an HE5XX? How dare Drop invoke the name of the glorious HE-500 and use the Deva drivers! Surely Drop is deceiving us and we must call them out on this for their shamelessness! Will, Drop's product guy, attempted to explain that there actually was some effort to create a custom headphone with the HE5XX (of course from HFM's parts bin and bag of know-how), but his explanation satisfied no one. Of course not! Once everybody on the Internet has been wronged (whether rightly or wrongly), the pitchforks must come out. In times such as this, steadier minds must prevail. So let's proceed with various analyses. I don't know the total answer quite yet, I so will be doing this along with you.