Yes i have used it for years off and on. It is a good thing. It is great to make a tea with along with mycorrhizae and other goodies. It is a nice, not burn nutrient.
the fish emulsion that i used long ago, was 5-1-1 it was too high in N and tended to burn my plants with not enough P and K. I find myself trying to avoid N rather than adding it, and that's growing not only weed but different veggies. there you go, i give you out the secret of getting great tomatoes, cukes and peppers, as well as MJ, don't overdose N, it is hard to get rid of it after the plants absorb it