I installed a Progressive Link this past Spring and I can definitely feel a difference in the handling, well worth the money.

 

I've had the Glide-Pro system on my 03 Road king for at least five years and I love it. I upgraded it a couple years ago with the newer bushings and the new motor mount. The second you jump on the bike after installation and start rolling you notice the difference, the bike tracks and feels so much more solid and true. I had ridden an FXR for several years before I purchased the Road King and when I first rode the King I immediately noticed how vague the steering felt and how when I was rolling at 75 down the freeway the bike would wander a little and never really roll in a completely strait line. Once the Glide-Pro system was installed that changed and the bike now handles and tracks as good as the old FXR and feels as solid as a rock. NO wobbles on the sweepers at all.