I'll get straight to the point. No killer likes to hear the sound of a boon coming up and having to deal with the pain of it all. In my own opinion, Boons ruin a LOT of killers in their powers. I'll give an example using one of my mains, Legion. The whole purpose of him is to make survivors injured with his power and waste their own time healing. Them healing together or self-caring, however they wanna do it. It's always gonna be a good thing to you to get some time out of them.
Now, say now Boon: Circle of Healing comes up. What the ######### are you supposed to do? It's basically a healing station if the killer can't find it. You heal at good speed (and thank god they nerfed the stacking), a killer had got to go practically at the end of the map to get rid of it which then you can just set back up in 16 seconds, and once everyone basically instantly heals, your power will be useless. Any heal-related perks that used to be pretty decent or good on any killer (take Sloppy, Thana, Hex: Peptimento for examples) are basically useless if you just set up a single Boon. Circle of Healing can also ruin powers of the following at well: Oni, Wraith (if you're hit-and-run), Twins, Executioner (in some cases if you Cage), Freddy (if he leaves for a teleport), Hag (being a hit-and-run secure killer). There's a lot of situations for killer that make it where they cannot leave a chase or that will all just be wasted.
Shadow Step I'm not gonna lie isn't that terrible for killers, it's just that you have to watch for blood in tracking.
Exponential I personally haven't seen it become any useful so I can't determine it. If I see another busted boon, like if you're in range of the boon you get haste or some #########, I'm gonna personally take it to DEVs because seriously, one is bad enough.
Enough about me ranting about Circle of Healing and the others. I personally have no problem with the other 2 boons. It would be nice though if Boons acted like Hexes. For instance, it's a 1-time use thing. You set it somewhere, you can relocate it, but if the killer snuffs it out, your perk is disabled for the Trial. Act it like it's a Hex, just that the totem doesn't die. The reason I say one and not more is because SWFs or just people generally will just all bring it into a single match. Then it'll really get out of hand. Plus the fact of there only being 5 totems on the entire map.
Apologies to those that think I'm just being a tilted Killer Main. The fact is though is that specific boons are just too much to deal with for almost any killer. Even as a survivor I question how good it is. I use it to test the uses all the time and most recently have stopped using it. In my opinion, it's a no-skill perk. Just hold "E" (default) on a totem for 16 seconds and bam you got an instant healing station that you can just keep placing over and over again. Anyways, I'll leave it to your thoughts. Again, sorry if I sounded tilted, but I think a lot of people are tired of it.