Engineer. Long-time interest in this area. Hate drudgery in engineering. Used Macsyma, Vaxima, and SMP. Have a paper copy of the SMP manual. Still assert that ThinkTank was a great outliner and miss some of the features. Frustrated with sharing or deploying Mathematica work I do inside a company---to the world openly via the cloud is easy--but controlled deployment within a company is not easy. Many very accomplished colleagues do not use Mathematica. And Mathematica's PDF export and Wolfram Player have problems and are not professional solutions.