IMHO, RotoFlow tanks FIX a problem that has existed for too long... No matter what type of gas line you use in a conventional tank, IT WILL get STIFF. And when it does, you will not know it until the engine quits unexpectedly.
When flying a $5000 airplane, I don't mind spending $30-$40 more for a gas tank I no longer have to worry about.
I use RotoFlow exclusively in my gas planes, but have not yet tried one with glow fuel.