I've mucked out a pen or twenty, the ammonia (pre-biochar) in my nose, and a manure fork through a finger. Still kickin'. I think I am qualified to comment.
"You load sixteen tons, and what do you get ..."
Sing it real slow, to the rhythm of the muck-stick.
Let me tell ya a story about a man named Jed. Poor mountain man with a tiny ad:
October Rocket Mass Heater days! Wheaton Labs October 11-17