Just picked up a pair of the Sines and I have to say, first impressions are incredibly positive.
I wanted a simple setup for when I work from home, using either my iPhone / Tidal or Macbook Roon / Tidal as the primary sources. No headphone amp or dac, just a streamlined system that offers a little bit of isolation. Straight out of my MacBook, my first thought was, "this might be my sound."
This is my first real experience with planars, though for whatever it's worth, I've heard the LCD-XC and really enjoyed them, though they're not practical for this application for me. I also tried the EL-8 titanium a few times at the Apple store, and was disappointed because I really wanted to love them, but couldn't. The Sine was the exact opposite experience - I was thinking they might a little too expensive for my desired use-case, and I was leaning towards wireless headphones ( Sennheiser HD4.5 BTNC ) but I found myself listening to track after track, just like I did when I first my little Grado SR60s a decade ago.
My one disappointment is that the Cipher cable is so expensive on its own, so I'm probably going to exchange my pair for the upgraded version. The prospect of future-proofing against upgrading my iPhone and having an integrated amp / dac / dsp feels like a better version of the future of headphones, for me at least, than wireless / Bluetooth.
Happy to join the club and looking forward to earpad madness.
Thanks to all for the impression in this thread and beyond!