I have a strong background in Engineering, having started as a mechanical draftsman, doing lots of drawings both with vellum and CAD. I'm as familiar with CAD systems as I am with vellum and inking pens. With that background, I find CADintosh a very useful program.

I have used it to draw up several detailed house plans, particulary when I'm about to embark on something ambitious like adding a new deck, or tearing out supporting walls in my house. I have no problems creating drawings to submit to local zoning officials to communicate my intent with before and after drawings.

My only qualms with CADintosh is that it's not terribly intuitive. I have a long history with CAD packages, including AutoCAD (yuck), ProEngineer, and a few other high end drafting programs, and even so, I end up going through the tutorial again each time I use it. If I used it more than a few times every couple years, I'd remember it better, but it should be easier to do basic things with it.