I had one from about 1973 till 1982. I kept it on the bike I was riding at the time. First a huffy, then a Fantom, Schwinn SuperSport, Serotta finally a Nashbar Sierra. I kept waiting for the break in period to end. I was not a lightweight and I rode 750 to 1000 miles a month from April to October. Finally got an Avocet touring 11 and gave it away. Wish I had it but only for looks because the thing was uncomfortable.
Picked it up for about $10.00 from a local bike shop that went out of business and has been a coffee shop in Erie Pa for a very long time.