About 6 months ago, I tried it on a FF and just could not do any more handstand pushups. Today, it got to the point, where I started off with 10+ without a break. And I ended the set of 9 by going 3,3,2,1. And the pushups were 2 at a time too.
Amazing - in a bad way.
But I am glad to conquer this demon. It was bugging me. But now, my shoulders feel like a flame thrower is pointed at each.