We are pleased to have the xinghen TSM up for pre-order now, it has an exciting new design as it can change size due to rotateable corners, this allows it to be 50mm, 50.75mm and 51.5mm depending on what you want, previous weird new mechanisms haven't been great such as the yuxin treasure box, but this seems promising as the mechanism for size changing doesn't effect any of the other pieces so the cube itself, if designed well, should be excellent.