Some have complained of liquid based self-balancing processes damage the tire, but the Counteract beads are micro-sized, synthetic beads that migrate to the out of balance side of the tire through static and centrifugal force. Since they're internal it means there are no unsightly weights stuck to my lovely new tires. The claim is that these beads work better than weights as they adapt to the changing conditions throughout the life of the tire. I'm hoping that they work as well as advertised.
On a cold, windy Saturday in February, I put the beads in through the valve stem using the provided small, plastic bottle, you keep gently squeezing air into the tube which pushes the beads into the tire...
The kit comes with valve stems and fancy caps as well. Once I've had the new tires out on the road I'll update this with an assessment of how well they work.
Update: it's late March and I've had a couple of chances to take the bike out. I'm surprised at how well the beads work. The wheels start off smooth and only seem to get smoother the faster you go. Once I've gotten the carbs sorted I'll be able to give a more accurate description, but early indicators are good.