I'm with Backpacker on this one....it certainly is an aerobatic manoeuvre, it's probably the most useful aeros manouevre you could take over into the Fast Jet /air combat enviroment but it is the one aeros manouvre that can very rapidly bite you in the backside if you aren't careful . Certainly when I instructed basic aeros many Moons ago it was the one I used to give the biggest/loudest health warnings about.
If it's correctly flown it can be done elegantly and without bending anything... but get it wrong ( especially burying the nose, usually because you didn't get the nose up high enough early on in the manouvere ) can at best end up with a bent aircraft and at worse with a smoking hole....
DON'T TRY THIS AT HOME....without adult instruction.