I agree - the '09 frame change eliminated the need for devices like the True Track. Spend your money on something you actually DO need.
I don't believe the 09 frame change solved the rear wheel wobble problem. I have an 09 SERG and experienced a rear wheel wobble on more than a few occasions in the past. In one case I was fortunate not to become a statistic.... it was that bad !
My confidence in the bike was shattered and I wasn't willing to keep the bike unless I could solve the problem, so I installed a True-Track stabilization device. Confident that my problem was solved, I continued riding like I had before, until the problem reared it's ugly head again, which was on the first trip after installing the True-Track. The True-Track device DID NOT solve the problem.
Again, I seriously contemplated selling the bike. At that point, the bike had 15k miles on it.
In a last ditch attempt, I installed the Glide-Pro bushings and I have not had another rear wheel wobble occurrence. The SERG now has 33k miles on it.
Others that have experienced the rear wheel wobble issue, seem to share a commonality with my experiences. Every one of my experiences included hitting a bump or dip in the road while cornering.
HD would like to believe they fixed the problem with the 09 and later frame design. That's simply NOT true !!