just received the M&O bt version, sounds exactly the same as RBH, the pad is much worst, the foam is extremely weak and your ear will touch the driver, but I swapped with HM5 angled right away, the build is actually alittle better, all the hinges fits tighter. The size adjuster actually stays in place which is nice. The included cable is also not as good. The battery does add extra 20g but that is expected, the BT range is pretty good, at least 10 meters. The 3.5mm plug is also left sided what matches with my other headphones and just feels right. Also came with a free acrylic stand on the current Amazon sale which I don't really care for. So in all, M&O offers the same sound with more functionality and $10 cheaper. Use the saving to get better pads