Back on topic, I just signed up for the beta too.
Most days I spend more time in PyCharm than anything else that's not my my web browser or iTerm, but I've been dabbling with VS Code for smaller things. As a Python web service developer, PyCharm is a pretty essential time-saver for me. VS Code shows some promise, and I give it "the old college try" every few months, but it still fails on a lot of critical paths for large Python projects. It definitely has the most potential of recent editors I've seen, though, and I use it for most other text editing on things like JSON, YAML, or shell scripts.
I think the idea of Panic building another new IDE is... neat? I'm not entirely sure how I feel about it. I have liked their products in years past, but now that I think about it, I haven't actually used any of their tools on a
regular basis for a very long time now. This is also a pretty steep mountain to climb if it's going to be proprietary macOS-only software. The preview screenshots look good, which is no surprise from this company.
I remember trying Coda years ago, and my general feeling was blasé enough that I have never felt motivated to go back and try it (or Coda 2) again.