Ride-On rocks
They probably used a product like slime that is not recommended in high speeds. I have been using Ride-On for more than six years and simply love it. Two sets of tires, great even wear. I haven't had a chance to test its sealing ability, but my bike rides like its on ball bearings. My dealer looked at both products and signed up with Ride-On
Dynabeads will eat your tire's inner liner. A friend of mine was using it and when they went to change his tires, they found a pile of rubber dust. Over time it "bead blasts" your tire insides so that porosity loss becomes greater. Also, if you have a warranty issue, the tire manufacturer will claim that you damaged their tires and will void their warranty with the beads. My friend also said that with the beads if he braked real hard and then rolled back on on the accelerator, the inertia would cause a temporary imbalance. I have never had that problem with Ride-On.
For my money, I say go with ride-on because you not only get a balancer, but it may actually save you from a flat too.