I get the hesitation but I know from my own experience that essential oils can work wonders and there have been several times I've turned to homeopathic remedies when traditional western medicine hasn't quite done the job. I've used Bach flower remedies (specifically Rescue Remedy on dogs for years) and they aren't much different from the Spirit Essences.
Everyone is entitled to their own opinion on it and we can certainly agree to disagree
We've been using the remedies for a little over a week now. Our aggressive "over owner" has definitely toned down. We've been able to integrate her back into the household and are only segregating cats at bedtime now.
The bully hasn't had a lot of improvement but he is a little less edgy, the 2 cats he likes to pick on were each on our bed with him at some point this past weekend without any flare ups.
One of my "victims" seems to be a little more relaxed and self assured, the other is not showing as much improvement yet.
Peacemaker is in all of their water bowls and that has definitely helped Diesel feel a little more relaxed. He used to respond to the aggressive cat with his own "I'm not backing down" aggression - that boy definitely has a FIGHT personality (fight vs flight).
So while it is early on, I am seeing enough improvement that I will keep using the essences.