To answer your specific question: "... thinking of upgrading?", at least one person is.
But I'm only thinking of it. I'm currently using Circuit Studio but my support has expired, so upgrading might be expensive for me, so maybe I won't.
Some customers seem to be a bit grumpy about lack of support and tardy release of upgrades, but I'm trying to be patient. Most other customers seem to want bigger, brighter and better features, but I'd be happy if Circuit Maker Pro didn't do much more than Circuit Studio but just put the various bits and pieces where I can find them.
I've considered a few alternatives, such as competing products and the cloud based Circuit Maker. That Circuit Maker is free is attractive, but that it is cloud based isn't for me, but might be for others. It seems to be neither better than nor worse than Circuit Studio, and they seem to be mutual augmented subsets of each other.
Maybe we are just waiting for Godot.