It's on the lower end of the food spectrum but if you are okay with feeding your fish Topfin, Wardleys, Aquaculture, and Freeze dried foods I don't see why hikari should be any different as it's pretty much the same as any of those brands.
The issue is it's not made of anything REAL. Just like in dog food where you want to see lamb, chicken, etc.. in fish food you want to see stuff you recognize like krill and salmon, etc.
You can definitely smell the difference. If I accidentally leave my NLS grow open my whole room smells like seafood when I get home from work... any of the brands I listed above wouldn't do that.
*Be smart.. Do your research!!*