I don't think there is much argument that the products "work". Algaecides do what they do: kill algae.If Vibrant is fancy marketing for Algaefix then the question remains if Algaefix is safe in a reef aquarium. API claims it is. Users have reported mixed results.
IMO, there are great many "good" algae living in a mature reef tank and an algaecide can be very indiscriminate. That leaves a lot of scorched earth in your reef. Somebody is going to fill that void. Will you like the new competitor more than the old one(s)?
For a FOWLR tank I say have at it. A softy tank? Why not? But if you are stocked with a bunch of acropora, caveat emptor.