Got the Edition XS six months ago, which I truly love, but am still using the 660S all day (both on XLR via Magnius). Nothing beats Sennheiser’s mids for YouTube consumption, or their comfort. Still my favorite pair of headphones since release.
Also grabbed the SHP9600 for $28 new on eBay. Easily the best deal I’ve ever gotten on headphones. They’re my bedtime MacBook set.
The updated headband cushion is softer and just more comfortable, in my opinion. You will feel the old one.