For those who don't know, this perk can be taken at level 8, with a mere 6 STR and 45 Melee requirement. With every blow from an unarmed/melee attack (except ranged) comes a chance to knock down your opponent. Knock-downs can happen repeatedly - meaning, you can knock down an enemy that has already been knocked-down, pinning them to the ground until they die. If you start attacking, knock down your opponent, and continue attacking, there's a very good chance your opponent will never get back up again. So far, I've seen this apply to humans and super mutants - possibly animals.
I don't regret taking this perk, as it's just another facet of melee, but I can't lie - it turns normal combat situations into a joke. Essentially, if you can survive long enough to get within melee range, the enemy is already dead.
Thoughts on Super Slam? It's uses? Strengths and weaknesses?