I just returned the kit and I have to agree there are a lot of materials in the case that are well worth going through. The borrowing time is just right with 3 weeks - of course if you finish early, return it!
It's a great kit that has both gadgets and resources. The resources have tons of ideas for home efficiency projects.
Also, even though I started at 300 plus on the waiting list I probably waited about half a year. You can always pause your hold if it comes up when you're going to be busy or away.