As beginners practise you can also stand there and spin a legbreak hand to hand then turn your body 90 degrees right and try and keep spinning the same way but having the ball spinning back to you. sort of coming at it a bit different.
Bit of a lucky dip type of ball for me, sometimes it grips and kicks a bit tennis ballish especially slightly damp matting, sometimes it's a deadset mullygrubber. Sometimes a big but slowish legbreak.
All old post but that is my experience of the backspinner completely. Ive been practicing it a bit lately as a way of combatting good back foot players.