The explosive pyre ones? I've used them in pvp but they don't have a huge effect the blast radius on the explosions are so big you don't really even need to chain the hammer explosions. I use the tracking perk seems to be better so me. Maybe if they toned down the explosive blast from the hammers it would be better, sunbreakers are absolutely powerful but I think they are just as powerful as blade dancers and we just aren't seeing blade dancers because everyone's using the new sub classes