I think they look awesome - I love playing with headphones and have a pretty fearsome setup for use at home. A mobile version of that would be heaven.
I’ve tried all the other solutions and they are all a compromise to a degree. I had a long chat with Roland about these (full disclosure, they are taking out some advertising and we’re helping them promote them) and I’ll be first on the list to buy a pair (yes, buy!).
We talked about the fact that Roland make super quality kit which is sometimes very niche, rather than items with wider appeal with compromises. Bass players are already quite niche let alone those on board with a headphone setup. But most knock it before they’ve tried it - paired with a feedback device like a backbeat or a floorboard, it’s absolutely Hifi and tactile.