To follow up on the cleave healing trinket "Thok's Acid-Grooved Tooth" asuming a ra-den type fight this trinket will effectively DOUBLE the healing from HR and Daybreak. The trinket can proc from every single heal in the game and HR heals 30-35 targets on ra-den depending on how many pets are up.
Even when we are not on a ra-den type fight this trinket will be absolutely insane in 25 man raiding. In 10 man on Galakras it was 7% of my healing and 9% of Tonic's healing.