I use the Sennheiser 800 phones and the superb Luxman P-750u headphone amp exclusively now and have no notion of going back to standard stereo now. The levels of detail are extraordinary and far superior in my opinion than speakers. The Senns. are a very difficult set of phones to drive and not any old headamp will do to let them shine but the Luxman does that in spades. My music speciality is classical piano and it is trully amazing just how different pianists sound and my setup lets me get right to the heart of the music without outside distractions. No I won't be going back to speakers.
Headphones vs full range speakers
I've never had any really high end headphones. I had like a $500 pair of Seinhauser earbuds for a while. I thought they sounded really good even pushing off a phone. Question is who has gone from listening to speakers for your main listening pleasure to headphones or vice versa. Can get something like the top of the line Focal Utopia headphones while pricey they are in line with "mid grade" speakers.
I don't entertain often at all and the wife does not listen anymore. Just started thinking why not simplify and get some kick butt headphones.