Is it worth getting a king zephyr tenor saxophone fixed up?

I was given a king zephyr tenor sax on semi-permanent loan. I get it for a long time (probably forever) but in case I need to give it back I can't sell it away. I'm an alto player and I wanted to take up tenor. Should I get it fixed up or should I just buy a modern tenor? The zephyr is model 196,xxx and it has a double socket neck, the three ring neck strap holes, and the old-fashioned clunky squared off pinky keys. How good is the intonation? I know a lot of vintage horns have intonation issues.