well ive never done any architecural work, but most of the drawings i do are just 2D stuff(wiring diagrams, harness builds, mechanical build ups, rack designs, etc). ive done 3D in CAD (scale models of airplanes) and its not all that great. try taking 4,000 points and connecting the dots to make an airplane....thats what i do. we are trying to switch everything over to solidworks just because you can do so much more and its alot faster then autoCAD. im going to take some classes on inventer and GIS this fall.