Rumor has it Columbus Tenax is just poorly prepared columbus tubing that was sold to schwinn cheaply. I have a super sport that is made of the same stuff that rides great. It took a car crash to stop the bike. The frame is still in tact with a slight buckle in the downtube.
Its the perfect frame to upgrade overtime. An entry level Tempo/Prelude/Super Sport can be had sometimes for nothing if you are lucky enough.
200$ powder coat/400$ set of handbuilt wheels,coldset frame/cassettehub=600$ entry level steel frame of much higher quality than any entry level Specialized/Giant/Trek.
Vintage rules. If you like the super sport you will really like the old Treks too.