I have been wanting a tube call forever. I bought a plastic one out of a bargain bin a few years ago. Only thing I can figure is it was a demo model that had been sitting in the sun. "Latex" (if that's what it is) on it was junk and fell apart immediately. How often do you have to replace the latex - what do you use for latex and how difficult is it do get the tension right?

I've heard Harold Knight run one and it sounds great. I'm sure K&H probably offers one - but you're right - even they don't seem to push it.