How comparable is this tool to AutoCAD?
AutoCAD is mostly used by people who already know AutoCAD or have to work with AutoCAD drawings. Most engineers have migrated to a model based approach years ago.
Any AutoCAD > 2006 (maybe 2004) is still very good today. IMO the versions after 2008 are bloated with shoehorned 3d stuff that work better on other software and isn't the core of AutoCAD (vector drawings).