Check out the fine print, FAQ's, and forums on those beads (any brand) or the Centramatic device and you'll find that they seem to be somewhat beneficial in most people's opinions if the tire and wheel is already balanced pretty well in the first place. Not so much if your tire and wheel are more than just a tiny bit out of perfect balance. I've spent some time reading comments from various types of users, from bikes to cars to trucks, and a common thread seems to be that for best results they have to do a conventional balance first before adding the beads or Centramatic device. This leads me to wonder if the reported results are in fact real, or just the result of people wanting to believe they spent their money wisely.
None of these "solutions" seem to work with tires and wheels that have any significant amount of imbalance, they also don't fix lateral imbalance or runout issues. As anyone can see in the video's they post, these things cause severe imbalance themselves when starting out and running at low speeds, since the beads tend to drop to the lowest point thanks to Mr. Gravity, regardless of where the light spot of the wheel/tire assembly actually is located. That of course doesn't happen with good old fashioned wheel weights.
My take on this entire subject is that it's not unlike the modern engine management systems that utilize closed loop feedback to tweak the base map for best operation over time as components wear or other factors change. The system doesn't make up for a bad base map, it just keeps a good base map working well. I believe the beads and Centramatic can be looked at in the same way, they can't fix a really bad balance but perhaps they can maintain a decent one over time.
JMHO - Jerry