From what I have noticed on my trees and experiments with cuttings, etc, Both HB101 and superthrive works. Especialy HB101 (both are different from each other and neither is a fertilzer). You can buy b vitamins for plants for less $ and it would probably be the same as superthrive. There used to be a rumor that the superthrive killed the michorrhiza (excuse my spelling)in the soil and thats why it was bad for pines, but it has no negative effect on soil fungus.
Al Nelson who is a very good and experienced Bonsai artist in So. California, told me that before Hb101 came out, He had a hard time keeping collected scrub oaks alive. He is known for his beautiful collected oaks.
I took some rose flowers I cut off a bush in my yard. They were in the same little group so they were at the same stage of developement. 1 flower went into a plain cup of water, 1 went into a cup of H2o with a drop of superthrive, 1 into a cup with H2o and a drop HB101, and 1 into a cup with water and both HB101 and superthive. I put them all side by side and the flower in just water withered in a couple days. The one in superthrive lated about 48hrs longer. The HB101 lasted about a day more than that and the rose in the cup with both lasted 2 days longer!
Im a skeptical person when it comes to stuff like that, but I believe they work and use them in conjunction. My local HB101 distributer is not bringing it in anymore from Japan, if anybody knows where I can get some, please let me know. Thanks