While I don't know the seller, the price is decent but just remember that some of the mods can't be easily un-done: foam removal, very hard to get the foam back in even if you have the original foam, the quarter mod will require you to get new pads if you don't like it, and the dynamat can be removed but its not the easiest thing to do, its a little messy to get it all off.
While I haven't done any mods to my HD-650 yet, I was also thinking about buying it so I could compare them but have other things I would rather spend on first (wine: chateau haut-brion 2010, $1000 for 2 bottles, or Elise amp + tubes, or Stax SR-507)
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Well the wine you can only enjoy once...