Well . . . I never did buy any of that myself, mainly because my Dad used to use it. He grew lovely roses and dahlias up in Vancouver BC for years. Every time he applied the "fish fert" as he called it, every cat, dog and raccoon in the vicinity would come around for about a week afterwards. Pheeee yeeww!
He finally stopped using it when the neighbor's big dog was apprehended rolling around in the dahlia bed. The dog smushed a couple of really nice dahlia plants, and then his owner came over complaining that his dog stank so badly, he had to hose him off outdoors, let him dry and then take him to the groomers to be de-odorized.
I understand they've made some effort to reduce the smell of the fert, but, well let's just say if you want to try it, buy the smallest bottle you can, and see how it smells before going crazy with it. It's also not a complete fertilizer, since it's missing the Nitrogen component, so you probably can't use it alone. It's a bloom booster, but your plants need something with some N to grow leaves.