Been using them for 3 tire changes now. They work well for me. I clear the valve stem with a pipe cleaner, put a little air in the tire and tap the stem as I slowly pour them in. Bike is smooth at all speeds.
I have used dyna beads in many applications and they are great. Using another product in a recent tire change on the UC called Ride On. It offers the same dynamic balancing as the beads, but additionally it will seal certain punctures. It is a water soluble liquid that will not corrode metal. So far it is working great with the balancing, hope I don't have to test the puncture feature. Be safe out there! Still have beads in my other bikes.
I'm currently using beads but have some Ride-On on the shelf to try at some point. You may never know if you have "tested the puncture feature" until you replace the tire and look at it from the inside.