First let me start by praising Massdrop and Sennheiser for coming through with a new iteration on what is still arguably the best sub $1000 line of open back headphones. My current setup has these going through either an Asus STX II or a Dragonfly Red depending on which computer I'm using, and these definitely stand out when comparing to my other favorite set of cans, the 6XX.
The big thing versus the other 600 series cans that I've tried is the low end is absolutely punchy and present. I was originally skeptical on the bass presence based on Massdrop's posted curves, but the bass is absolutely there. Almost to a fault I find, as on more modern songs it seems like the bass is so present that it begins to shroud some of the mids. This is especially notable on some more modestly mixed songs featuring female vocals, like Stereolab's discography. The abundance of the low end is very nice, but can also occasionally lead to some of the low end being too muddy and indistinguishable, which is a minor gripe for me, but might be the kind of thing other listeners are looking for.
The colorway, too, is also extremely slick, and these might be my favorite headphones just from a visual standpoint, but that's mostly personal preference. They also work way better than I expected when plugged into my Pixel 2 with no amp, the audio quality was much clearer than I was expecting, and I might just continue to use these for mobile since my Dragonfly is very stingy with how it works with my phone. Overall I like these headphones, but the overabundance of bass is something I'm not really looking for at home, and I find myself having to run an EQ to boost the mids a bit. That's mostly personal taste for me. That said, these are definitely worth the price of admission, especially at only $150, I'll likely continue to use these with my phone, but for anything else I still prefer my 6XXs.