It seems to very rarely work and not only do you leave yourself open but there is a high chance you'll break your arm. It seems like fighters rarely mention how they break their arms during their fights but it has to be one of the top causes. Felder ko'd Castillo with it but it's also likely how he broke his arm against Mike Perry, PVZ broke her arm throwing one and it might be how Mustafaev broke his arm as well. I'm sure there have been many more examples of fighters breaking their arms attempting it. I feel like it's something you should only attempt if you know it'll land and land properly. Fighters just wing it out there like their arms are made of steel and nothing could go wrong. I feel like it's much more risky to the fighter throwing it than it is to their opponents but I could be wrong.