It was exactly as entertaining as the two one night heavyweight boxing tournaments of which I am aware. One happened in the 90s and the other occurred maybe five years ago (Tony Thompson won it). Both times, the claim was that having matches of three, three minute rounds would speed up the action. Instead, every fight was one guy simply fighting to outpoint the other in the safest way possible so as to avoid injury and conserve his energy.
There was one of those last night on Sky Sports in the UK. Quite a few KOs.