It's something that I would save for near-dead targets. Or ones that are positioned against some obstacle to prevent knockback.

Despite it being necessary to squeeze out YOUR optimal damage, there are things that must be assessed for it to roll out smoothly. First and most obviously, if your party is able to place ground AoEs or the other DPS rely on melee, just don't use it. Even if the melee has alternative targets they can use to avoid breaking their flow.

Also try to assess the skill level of the tank (no I'm not talking about how high his level is or the abilities he's unlocked, but more his apparent understanding of his role). Some believe that it's the tanks job is to waste the enemies efforts as much as possible (this is correct). The other kind think it's their job to make sure the enemy can hit them at every possible opportunity besides AoEs. The latter are stupid and will probably run after the knockbacked enemy regardless of whether it screws up the position of all other enemies, whether it was their target or not, OR whether they still maintain highest aggro. Or they will just express fury at you out of an unbending and ill-thought-out disdain for any and all forms of knockbacks.

It's not worth the risk in some DF parties. Even if you're being careful not to tamper with the efficiency of others, you could still be throwing yourself in the firing line of a vote-kick.