Just got mine. One of the first 500 produced, which has never happened before. My first major headphone purchase was about 15 years ago when I got the Sennheiser HD600. That was my main headphone and my "TOTL" for many years. For the past few years, I've very much drifted towards IEMs and CIEMs (Etymotic, then Campfire, then CIEMs A12t and A18t from 64 Audio). I'll post a full review once I have a few good listening sessions but right off the bat...wow, love the separation. Soundstage is great, and more than enough depth. Only con at the moment was that - the first song I play on every new headphone/IEM is "Lonesome Tears" by Beck. This was the first time Beck's vocals on that song sounded nasally. Other than that one instance, I'm highly enjoying these and they seem to fit beautifully into my collection (on top of the C/IEMs I mentioned as well as the HD600s, I also have Audeze LCD-XCs and recently got the Massdrop Hifiman HE-4XXs. I'll most likely do a comparison with the LCD-XCs if anyone is interested). EDIT: The nasally vocals on Lonesome Tears has seemingly vanished after several hours of listening time. Most likely due to the CIEMs I was using all day prior to receiving the 820s. No huge cons at the moment for me, currently. Will post larger review and comparison to LCD-XC within the next week.