B,
It's not really a fair question, as I use CAD on a daily basis. I will say that Viacad had almost a flat learning curve for me. I was using it within minutes.
They have a bunch of tutorials for folks that don't use CAD daily, and the tutorials seemed very easy.
Oh, it's a totally different product than the Architectural Series. It's a different group of programmers, who did some licensing work with Ashlar Vellum.
Oh, they have a forum if you just want to talk... if you sign up you'll have to send a PM to Tim Olson to get activated.
http://forum.punchcad.com/index.php
Mike...