After I got my Icon install straightened-out, I had the most awful squealing and squeaking coming from my front end you would have ever heard. If you ever had a pickup with worn-out leaf spring bushings it sounded like that, but much worse. At low speeds it would chatter incessantly and it was literally driving me nuts. I brought it to Ducmonsta's shop to have him double check everything, to include tearing the Light Racing UCAs apart and lubing everything they could see. Didn't solve the issue completely right away, but after about 2,000 miles on the suspension since Ducmonsta's shop rebuilt everything I no longer have any noise. Still not sure what was causing the main issue: the Icon components or the UCAs.
The Icons do, according to Icon, have tighter seals than most other manufacturers, so they admit to squeaking a bit more than others. However, I've only heard abnormal sounds from them since I got everything straight when I shake the truck back and forth or I go over a harsh and immediate bump like the end of a driveway or speed bump; it creates a distinct, short-lived mix between a pop and a squeak and I can only hear it with the windows and radio down.
If you want to know more, do a quick Google search for "Icon squeak" and you'll see a bunch of mixed reviews about the sounds Icon suspensions make.