I found an interesting history of parametric CAD, especially of the original inventor of it, struggling as a Russian math professor immigrant who had to leave some of his family behind, and to go against the entrenched giants of the day with a radical idea he believed in.
http://www.fundinguniverse.com/company-histories/parametric-technology-corp-history/
its good when you know how to use it only know how to do cabints at the moment that way