I never got anything out of any comparable products. It looks like kent essential elements and some food, to me. I am not sure what they do that you cannot get out of feeding your fish a little bit more (food) and keeping up on water changes (elements). For softies and birdsnest, just keep your PO4 and NO3 barely detectable (clean, but not too clean) and have some good light. They should grow like crazy.
If you don't like the change water, then they could be pretty good.
You might need to use it for a few weeks, or a month, to see if it does anything.