I have been using progeCAD Pro. for about a year and a half now and I just love it. It's full 3D, solids, rendering the hole nine yards.
Yes it pretty much is an AutoCad clone I realized this when asking for help on my CAD designs in the AutoCAD section of various forums. The solutions the members would reply back with work exactly the same in progeCAD.
I did have an issue with support a while back but they have since stepped up their support system.
I am truly surprised that more designers have not jumped all over this software. I guess if the workplace is paying for ACad there's no need for an inexpensive alternative.