I have to use them out of necessity because I can't find a substitute
I have to use pheromones because my cats don’t get along. I’ve been using them for years, always the Feliway ones, and out of the three types, these work best for them. But I don’t think all the bottles are the same. It feels like some bottles work better than others, and of course, since it’s about stress, the brand would probably say it’s not the bottles, it’s my cats, but that’s just how it seems to me. I haven’t found a substitute that works as well either. The Acalma spray works really, really well for them, but I think it’s because of the valerian scent.