Super durable, super heavy. Last one I bought (a couple of years ago), I paid $10 for it and donated it. May be worth $50 in a strong market. Unless you have unlimited free time and a pile of consumables, not a good choice to rebuild. Now if you just want a bike to ride around town, no hills, nothing serious, maybe....
FWIW, I used to do centuries on my Schwinn Continental. Of course, I was 15 years old at the time, and I lived in the flat lands.