I've only ever bought the ratshack shrink tubing because I have no other easy way of getting shrink tubing. It's always worked for me. Ignorance is bliss, I don't know what I'm missing I suppose.

For instance, I used to work at a jewelry store, and they used a special kind of solder flux that was amazingly good. I got used to using it, and really liked it. Then I stopped working at the jewelry store and had to go back to the Radio Shack brown-sticky-paste stuff. Yuck! I've gotten used to using the paste again, and I can now use it as effectively as I could use the jeweler's stuff, but I still dream of the old days.

So I can understand how it's possible to find something that's better quality than rat shack. But if one has no choice, one goes to rat shack.