Boosters will give you bigger buds because they are adding higher doses of Phosphorus and Potassium. The downside is that it is easy to burn your plants if you dose it too high and if you are unfamiliar with how much nutes your strain can take. Another downside is the bloom boosters can produce iregularly shaped buds with fox tails and clusters coming out of the flowers; rather than the normal round and coned shape of typical flowers. But if you don't dose it too high and burn your plants it will produce higher yields. There's no doubt about that.