Loren,
I installed the fluidampr some time back, probably 5-6 yrs and around 45k miles ago, presently 228k miles on truck. The stock one was still pretty good but I noticed the rubber was deteriorating, squeezing out on front and back, the alignment marks were real close but off maybe a 1/16” so I went for it. On first fire-up I immediately noticed a smoother idle and just all around the engine ran smoother. Highly recommended, I think I got mine thru Summit for around $425, I also think a stock replacement was either similar in price or slightly lower, forget. For the $425 I think it was well worth it. BTW unless you are running high RPMs (over what it will do stock) don’t bother with the pin kit (pins the dampener to the crank), just make sure to torque to specs provided. Enjoy!