I'm excited about this (and all things Sketch-related), but I thought this was a product release from the makers of Sketch until I saw the disclaimer at the bottom.<p>$39 seems fair, though I'd rather see this as an open-source project that the community could contribute back to. According to the changelog, this is a v1 release and the website contains no statements about the $39 buying future updates for new features or updated versions of Sketch, which is disappointing.<p>Aside from a few screenshots, it would be nice to have a YouTube video demonstrating how it works in practice, in real-time, especially considering the terms stating: "As a customer you are responsible for understanding this upon purchasing any item from Sketch Design System".<p>I wouldn't buy it without more information, and knowing who is behind it. There's no "about" section on the website with a real person identified. The domain WHOIS data is a proxy service.