They're 100% fully serviceable, you could replace every single part yourself as long as you're careful, & they blew me away for only being $200, but I want an option for it to come with balance cables in the box it comes in so you don't have to buy it separately. Same thing with the hard case, there should be an option for it to not come with the case so if these are a little outside the price range of some people, they can afford them. Back to how they sound, they have astonishing sound quality for what you buy them for compared to something like the Hd600s, the Beyerdynamic T1s, or the AKG k712s. I can't hear the bongo man in the right ear cup in September by Earth, Wind & Fire as well as other Hi-Fi headphones, but I can still hear him smacking away. These are like right before getting into full audiophile equipment, they're perfect for the average person that just wants a nice set of headphones that they can use at home, on a plane, on a walk, just anywhere and still get relatively Hi-Fi sound. It's not perfect, but you definitely get your moneys worth when you buy these. They're also light as a feather, but stiff as a board, and they don't even need to adjust them, you can just slide them on your greasy face and you're good to go. They definitely won't fit everyone, but they'll fit like 95% of people. These are also only 1 of three pair of headphones I've ever bought where I didn't have buyer's remorse. (The other 2 were my Hd600s & my Grado Hemps if you were wondering.)