Well, these arrived a day early.
And here are some thoughts.
Build quality – Mediocre for a HP w/ $349 MSRP. Biggest gripe is the poorly glued leather piece on the headband. The underside seam is very visible with tons of folds and wrinkles, and the ends are abruptly cut with glue marks (enlarge to get a better picture). I also found the included cable very microphonic. The rest of the HP build is fine and I appreciate the easily swappable pads.
Comfort - I rate highly the big, round (the opening inside is oval shaped), and thick earpads, but found the headband suspension a bit stiff and definitely felt some pressure in several spots, where I had to periodically readjust. The earpads are soft but the material used is a bit abrasive (reminds me of the wool blanket I was issued in basic training decades ago) and my ears got toasty pretty quick. Not the most comfortable out there and hope they'll loosen up a bit overtime. These HPs feel lighter than the advertised 380g weight.
I'll keep the sound impressions at wavetop. We all perceive sound differently, so take my words with a giant grain of salt. I'll just highlight a few things.
I found them very sibilant out of the box. After running it for several hours, and once my ears readjusted to the new sound (not a huge burn-in believer), they felt a bit more manageable. But it's definitely there and they're quite fatiguing for me (For reference, I don't find Beyer T1.2 sibilant). I don't see myself wearing these for an extended period. To be fair, I found them more sibilant on my Topping A90/D90 stack but less so on my other setup (SMSL M400 + Focal Arche). Older recordings sounded mostly fine, but some modern recordings can be sibilant or overly sharpened. However, they are not grainy, or metallic like on some bright HPs, so I can see how the sound signature can be appealing to people more tolerant to sibilance. Overall, I find the treble a bit too forward for my taste (they don't sound thin like the Beyer T1s). If they dial it back just a tiny bit, IMO they'd make for a great all-rounder. Other than the forward treble, I think the lows and the mids are well-balanced. It's quite fast and imaging is really good. The soundstage is proper for a HP. Not too boxed-in or artificially widened. They just feel right. I don't like HPs that sound distant with exaggerated soundstage.
So, do I think it's worth the asking price? If you can pick one up at a discount (currently $249 on Amazon), I think it would be a worthwhile purchase. Otherwise, I personally wouldn't pay the full $349 MSRP.
Overall, I'll probably keep them as they don't sound like anything else in my stable. With that being said, I would be hesitant to use them as a daily driver. It's definitely a good flavor to add to the collection, but if I can only afford to have one or two HPs, these aren't it.