These were really simple to use. I began learning SolidWorks today and seriously just following those short (compared to Inventor) learned how to use it in just 3 hours (I started Inventor tuts but quit after 3 hours of getting almost nowhere). It was actually really awesome making something. Although what I made was never stress tested it look really cool
I hope there's no legality issue, b/c I honestly really liked these. And Craig's suggestion to start off with SW was spot on. =)