Got them! It turns out that it was not the 650 that I tried (I was stunned when I saw the 650 and they did not look like what I had tried!). Nevetheless, the sound is really, really good. Not anywhere competing with M80, but in my living room, the bass is really deep and balanced, instrument attacks and releases are accurate and the headphones have nice dynamics.
Pretty happy with my purchase! Now, all I have to do is find a friend that has a headphone amp to see (hear?) if there is a noticeable difference with the jack out of my 805.
