I've been a software engineer writing code for my whole career and the RefactoringUI material has helped me grow my design ability more than anything else I've tried. It's great for people that want to make their work projects look better, want to build a side-project that doesn't look god awful, or become more self-reliant in the quest to be the ultimate "company of one" product maker.
Here's my portfolio that I've been developing since I started following Steve and Adam's tweets/posts/videos: https://dribbble.com/swanson
Regarding the price: I think it's totally fair, especially given how much free content RefactoringUI has put out. $80-$149 is worth it to me for the years of distilled experience (and to support more of this material getting made). If it's too much, check out the free stuff they have: https://twitter.com/i/moments/994601867987619840 https://www.youtube.com/steveschoger and save up :)