I do not mean to be jerky or anything, but the convoluted coils are not worth the money at all in our case. They will not hurt anything, and look totally badass, and who knows, maybe in the real world they do add something to the equation. But in my experience and theoretically, a convoluted coil will provide no advantage in our situation.
Here is a blog I wrote to detail the subject for those interested. Do I have turbulent flow in my chiller? - Home Brew Forums
Basically, in a 1/2" tube, you need less than 1 gpm (gallon per minute) of flow to produce a fully developed turbulent flow (this is for a straight smooth interior tube, our situation would be lower than this). A standard garden hose puts out well over 5gpm and even my March pump puts out at least 3gpm. In short, you already have fully developed turbulent flow within the tubing without anything additional (wire or twists).
Fully developed turbulent flow is important as it provides the greatest heat transfer from the coolant to the coil.
A more impactful factor is the turbulence of the wort around the outside of the coil. However, in you CFC, you will likely be flowing the wort well above the flow rate needed for fully developed flow.
Again, I am not ragging on anyone's equipment just putting out the fact that flow will be turbulent in your chiller with or without the extra stuff. It may save you a few bones.