Personally after using a set of Caltracs on the 08, I would rather get a traction bar setup. But they do work and you can't beat the price. My only tip if using them on the street is to install some rubber hose around the pin that hits the leaf spring. They will make a lot of noise if not.
I'm interested as well, as i'm torn between having bars under the truck, not sure if i like how they look. But i need something bad, tired of having my glovebox and ash-try open up when it gets to hoppin. LOL