Is headphone listening a primary or backup for you when listening to music?

High end headphones 90% of the time. And I actually have treated room and room correction. Still does not sound as good as in planar cans.

I have a dedicated desktop headphone HiFi system, but I do keep a high quality headphone system integrated into my main speaker system that I use purely for diagnostic purposes and providing a different perspective of reference when making changes at or near the source. This can be very useful.

I got back i to phones when got divorced.   I packed up all of my gear,  put it in storage and got a decent headphone set up.  

That was 5 or 6 years ago but I still use it occasionally.     

I use it when it's late also.  Great way to listen without bothering others.  

I rarely use headphones at all. I used to use them for two months each summer, as I would move to a college campus to run a educational program. I’d bring a turntable, a phono section, a headphone amp, and a decent pair of headphones (like the Audeze LCD-2), and 50 albums. The sound was pretty good, and I enjoyed learning about recordings from that perspective. But though I’ve tried many headphones, I’ve never felt comfortable in them. Every one of them feels too hot, and with too much pressure. I’ve had friends say that no, these headphones really don’t have much pressure, but for me, they are all pretty much intolerable after an hour. I want the sound outside my brain, for the most part.  As someone else said, they do come in handy to diagnose something going on in my system - I can remove the room and the speakers and listen. 

David

I’ve got both, and while headphones are nice they cannot put performers and performances viscerally and as big and spatially in the room like a home system can — not even close and not substitutes at all.  I like headphones for what they can do and my home system for what it does, and never the twain shall meet.