Has anyone playtested Rebuke of the Talisman and was it effective?

Is it a dud or does it deliver? Were you happy with Talisman compare to other pact boons?

Thanks.

I haven't played it, but can I ask,  "What makes you say it's limited  if the opponent has more than one attack?" 

Rebuke of the Talisman lets the Talisman Warlock use a Reaction for Psychic damage and pushing the Opponent away 10 feet from the Talisman Bearer  when the TB is hit by an Attacker who is within 30' of the TW.. It doesn't prevent the attack that triggered it from hitting, or doing damage to the Talisman Bearer.

So, yeah, an Attacker with multi-attack and enough Move left can run right back up to the TB  and keep attacking. So can an Attacker with a single attack; though they won't be able to attack until their turn comes around again, unless an Attack of Opportunity presents itself.