I've never had any total failure coils, but some better than others. Last week, I put a new one in my wife's Kabuki, and she wanted to know what mixture I used, as it tasted fantastic to her. Sadly, I had to tell her that i could not duplicate it, as the mixture was the same, but the coil was the best I have ever seen in a nauti coil.
The one difference I have noticed in the rebuildable so far, is that there doesn't' seem to be the break in time required as in the Nauti coil. (Oddly enough, the Triton Mini doesn't require it either). But the biggie for us, is that the Nauti coil tasted great after it first breaks in, and then slowly degrades. To the point that you when you put a new coil in, it's almost like "Hello"!!!, Now that is what it is supposed to taste like. It degrades so slowly, that you almost don't notice it but it becomes really apparent when you change.
What I'm finding with the rebuildable, is No Break in. (The first use, was terrible, but totally my fault). #1 I didn't properly clean it, and #2, it had a off rubber taste to it. I pulled the Red Rubber "0" ring, and replaced it with the yellow "0" Ring from one of my Triton Coils. The Liquid had to be dumped from the tank, and th4e tank rinsed, as the off flavor was permeated into the Liquid.
Once cleaned, and the O'Ring from the Triton installed, it has been vaping pleasure ever since. Very pleasureable, and it does not degrade anywhere nearly as fast as the Triton Coil, which does not' degrade as fast as a Nauti coil. So a real Win-Win!

Knife