It's free! Here's a link to the site:
Sage | WordPress Starter Theme with Tailwind CSS & Blade
I originally thought it was a theme builder like Divi when I first saw it mentioned and saw it in use on other wordpress sites.
It's basically a framework where you have to code out the theme. It's like writing from scratch, but Roots provides the groundwork so it's not completely from scratch.
Since programming and development is a hobby of mine (which is what my blog is about!), I would say that I like the workflow. It's similar to how I have been doing my other projects. Highly customizable.
That being said, I'm not familiar with all the tools used by Roots, specifically Laravel. So that has been a hurdle for me but I think I'm getting the hang of it now (after much trial and error). Also if everything is custom-made, it's going to have to be maintained.
Honestly, using Sage for my blog is way too much. From what I gathered, it shines more when you have a lot more complexity, which I don't.
But I wanted to give it a go and try it out.