1) I like being able to hang my CRL and then toss the tarp over it. I use toggles on a prussic to tighten it.
2) I have found the hard way that 25 feet of Zing It is not long enough for many CRL applications. I've considered cutting my Zing it in the field to make a non-continuous ridge line but then I found a different way to rig it. So that may be a disadvantage to a CRL. Then again, Zing it is so light that carrying a 35 foot length would add essentially no weight. But twice I've run into a situation where I didn't have quite enough ridge line length so I had to improvise by either choosing a different tree for the tarp line or by extending it with an extra piece of glow cord I had.