I have been using Dyna Beads balancing beads in my tires for many, many years. They are far superior to lead weights, as they balance perfectly, and adjust as the tire wears, instead of having to pull weights, rebalance the tire, and reapply more weights. I have used them in three different motorcycles, as well as my Ford Explorer - when I was completely unable to get my Explorer's wheels balanced through any sort of weights, I ended up pulling ALL of the weights off and putting 6 oz of Dyna Beads in each tire - and it worked! Perfect, smooth tires, for the life of the tires.
Balancing beads help prevent cupping of the front tire on our heavy bikes, which is a great benefit. They are easy to install, and if you wish, you can retrieve them from your old tires and install them in the new tires.
When I put this last set of tires on my GL1500, I decided to try a set of Counteract beads to see if they worked as well as Dyna Beads. 11,000 miles later, the tires are worn out, and I have pulled them off the bike, so I can give you the full results.
Dyna Beads and Counteract beads look VERY similar. The main difference is that Dyna Beads are tiny ceramic beads, while Counteract beads are made of hardened glass.
Installation
Installation of the beads is very similar. You get a small squeeze bottle with a tip, and a small hose. You remove the valve stem, then screw the hose over the valve stem. You fill the bottle with beads, then put the tip of the bottle in the end of the hose. The beads then flow through the hose into the tire. In theory. Both manufacturers suggest vibrating the hose and bottle with an electric toothbrush or other vibrating instrument to convince the beads to flow. In my experience, this is a long and tedious process, with plenty of jams. Instead I pour the beads in until the hose inevitably backs up, then I remove the bottle from the hose, apply the nozzle from my air compressor, and give it a quick blast of compressed air. This shoots the beads into the tire. Repeat until the beads are gone.
The thumbs up definitely goes to Counteract for installation. The Dyna Beads are prone to static, and seem to stick to everything - including the inside of the bottle as well as the inside of the hose:

Conversely, the Counteract beads have no such affinity for static, and flow much easier.
It is VERY IMPORTANT that the tire not be installed using goopy, sticky tire lubricant, as this will cause the beads to stick and clump together. Instead, water-based tire lubricant should be used, that leaves behind no residue when it evaporates.
Performance
Both sets of beads balanced the tires perfectly for the life of the tires.
I have been using Avon Venom tires on my GL1500 for as long as I have owned it. With the Counteract beads, I got about 2,000 miles more before the tires were worn out. With my last set of Dyna Beads, I actually experienced some front tire cupping for the last 1,000 miles of tire tread life. I did not experience this with the Counteract beads. Whether this is due to the beads, or from some other external influence, I can't say.
I will give the thumbs up to Counteract for performance.
Price
A two-pack of 2 oz Dyna Beads on Amazon is $18.49 (at time of writing).
A two-pack of 2 oz Counteract Beads on Amazon is $25.97 (at time of writing).
However...the Counteract beads also come with two new valve cores, two new valve caps, and a valve core removal tool. If you are using rubber valve stems, you should be replacing them at every tire change anyway. If you are using metal valve stems, you would do well to replace the valve cores. You will definitely need a valve core removal tool, so it's nice that they supply one.
Overall, the price win goes to Dyna Beads.
Internal Tire Wear
This has been a big question: what if the beads wear the tire from the INSIDE, causing tire failure? In my experience, there is some minor wear, evidenced by the smooth surface and bits of rubber dust, but over the life of the tire, nowhere near enough wear to cause any worry.
This is a tie, both beads wear equally: negligible
Reuse
The beads can be collected and reused again, as shown here:
Both are equally able to be reused, again a tie. You may want to wash the dust out, first.
Overall
Overall, despite the higher price, I give the win to Counteract beads. They are much easier and less frustrating to install, and initial experience shows that my tires lasted longer with them in than I saw on my previous few sets of tires using Dyna Beads. I have installed Counteract beads in my new set of tires, and hope to see the same experience repeated.