Don't get me wrong, I have had multiple pairs of 770s over the last 20-25 years. I love them. In the under-$200 closed-can range they are really hard to beat. However, as I have started using more expensive, more hi-fi headphones, I find myself reaching for the 770s less and less. When I am listening casually and just want to bump along with some deep, deeeep low end, I go for the Audeze EL-8. Not neutral, but really fun! When I'm mixing, and needing neutral but accurate detail, I reach for my HD-600s if I'm not worried about bleed, and my old Sennheiser HD-250 Linear 2s if I am. I find that I am mostly reaching for the 770s when I am tracking. They have always been built well and with good isolation. If I am recording someone else, I don't have to worry about them dropping my headphones. The 770s can take it. Obviously, these other headphones are significantly more expensive than the 770s (or out of production). But that doesn't change the fact that when using my 770s, I find myself missing the bass information below 60hz and/or the 10+khz detail. That is exactly why I am so interested in the 177x. I'm hoping that this can be the extended version of the 770s that I have been imagining.