I buy some stuff from BSD so I also tried the golden pearls just as tank food. As you know I dispense it similar to what tebstan does in the auto feeder along with Fauna Marin powdered foods.
I noticed I get more cyano when I use the GP so I stopped adding them.
I guess that's really probably the main concern. I know especially with seahorses bacterial infection and water quality issues are a major cause of loss so perhaps the convenience of not having to culture livefood is balanced with the trouble of having to watch water quality much more closely?

I just went back to culturing live phyto because I messed up the balance in my big tank quite a bit with dosing too much frozen algae paste. It's much harder to overdose live foods - much easier to overdose frozen/dried/dead food.