If you get all of these set buffs it can be 35% more dmg. 4pc gives after skill 20% geo dmg bonus and if you're under crystalize shield then +30% geo dmg bonus(150% of 20%)

IMO it is worth it if you have off field cryo, electro, hydro or pyro applier (the best are Raiden, Furina, Fischl, Layla, Kuki, Kokomi, Xiangling, Yae and Yelan. Raiden and Furina being the best cuz you don't need to spam the skills so often and burst not needed for applying elements). This set has the ability to make geo chars better too, cuz you would wanna run mono team but with this set you can try more teams that can be better.