I had no need for a "Clear Dock" so never tried this utility. I liked the subtle shading of the dock against the background. However, when I found a desktop pic I liked where icons needed a darker color to be easier to see, I decided to check out ClearDock.
This is a nifty app! In addition to removing the dock background, you can pick one of your own. Me? I just darkened my dock and stuck with the desktop pic I liked. Unsanity rocks!
I'm running 10.3.1 and ClearDock seems to work great.