I see a lot of folks here comparing this to VS Code and asking "Why would I use this instead?" — I am exactly on the opposite side of that equation. Why would I use VS Code when I can use this?
I've been using Atom for most of the decade (plus a bit of Sublime, and TextMate before), and I've loved being able to hack it to look and feel exactly how I want. There's a ton of custom CSS in my setup.
Now, Atom is slow. That is a daily frustration for me. The latency on every keypress is grating. I've stripped out every package I can, and that custom CSS I mentioned is mostly hiding things I don't want to see. But still, the lag! I feel it all around.
I tried switching to VS Code, but it was appreciably worse for me. I couldn't configure it to look as nice as Atom (and it had the unshakable feeling that it was made by folks from the Windows school of design — plenty of weird [to me] spacing and typographic choices). It also didn't feel any faster.
So why does Nova appeal to me? Well, Atom is no longer supported, so I'm going to have to switch to something anyway. Nova doesn't look as minimal as I'd like, but I can live with that — at least it looks nice! And it's a native app, so it should (in theory) be buttery smooth.
When it comes to a tool I will spend all day, every day in, $50/year is peanuts. This is my working life. It's worth spending a relatively tiny bit of money to have something nice instead of something good enough. Price is a non-issue for me.
As for extensions... I don't use any. I stripped them all out to try to make Atom faster. So now I get to discover what extensions are available, without being left longing for something I had to give up. Maybe I'll build an extension for myself. This is a new frontier for me.
So we'll see. I tried Coda, didn't like it. I love Transmit, though. So if this tool lives up to its promises, and succeeds on its own terms, I'll be thrilled. For the folks happy with VS Code... that's fantastic. I'm glad you have found a tool you like. For folks like me, for whom VS Code just felt off, this seems like a great option.