Once installed, this will open up all sorts of options for better grips on your bike. The black powdercoating may interfere with the throttle cable ferrules, it just takes a little bit of persuasion for a perfect smooth fit. With proper lubrication you can get very smooth throttle action. A little pricey, but it is well made, and superlight.
This thing is built to last. Throttle tube slides perfectly over the Biltwell bars, and works great with my stock HD controls. Used some Permatex Anti-Seize Lubricant as suggested by Biltwell, and the throttle operation functions so smooth. More money than I wanted to spend, but I'm super impressed with the upgrade.