You must keep them, for they represent a time and a place in history, and were the go-to equipment for you at a particular time and place. Imitation is flattery in its highest form, and it certainly says something about the timeless nature of these reels that they are refined and reintroduced after so many years.
It also says something that you can fasten one of those reels to a rod at any time and go out and fish them with confidence.
I don't currently own a CFO, but I love the simple, elegant design and always have. I've decided that this new version will have a place in my collection of reels. I'm tempted to pair one with a new Superfine glass rod. I think that would be a winning combination.