What I've learned already since signing up for HackEDU has proven priceless in terms of protecting one of our major clients against data theft. This week I've been cleaning up several broken authentication issues on their site using the info I've learned just from the course!
Exploiting and then fixing the code is great. Hands on and eye opening, love it.
Really love the fact that you can live patch the application. I really like how easy this makes it to see and understand the problem.