So I purchased this last week and must I say, there is nothing else like listening to my HD 650.  Sound quality was great with using the hd 650 straight with my iPhone, but boy did this step ti up a notch.

I am no audiophile but I can say that these headphones are the best I have heard while I spent a grueling couple of weeks looking for a good pair of headphones.  I started off with Dre Beats but felt like I squandered my money so I returned them and started looking for a real pair of headphones.