Greetings Eric,
Brother Alan speaks my mind -
amen! I have trained a few people in DataCAD, and they have had experience in AutoCAD, ArchiCAD, VersaCAD, and others -- and come to think of it, several people with experience with NoCAD! It is
some of the latter folks that have the hardest time learning to use CADD -- it is a major shift of thinking, in some ways, from manual drafting. However, others w/o any CADD experience take to it like a fish to water! It all depends on your attitude.
The most important thing is to try to adapt your previous experience -- to understand the differences, and to use the common points as references to start the transistion.
DataCAD was designed by architects, for architects. AutoCAD seems to be designed by software programmers for just about everybody.
In DataCAD, you just click on the screen and draw. In AutoCAD you have to type something before you can draw, AFAIK.
The vectors in DataCAD are always the same size, no matter what the scale is -- changing the scale only affects the units used in reporting the size. In AutoCAD, the vectors change size depending on the scale used. DataCAD makes sense on this; AutoCAD does not.
There is the not insignificant issue of cost: AutoCAD is what, $5,000+/- for every seat, and $2,500 per upgrade? DataCAD is $1,000 for the first seat, $500 thereafter; and $300-400 for upgrades.
DWG's change with just about every upgrade (didn't v13 have about ten different files versions?); while DataCAD had one file type, DC5, from v5 to v10 -- about 12 years! One has to wonder how DWG could ever be considered "the standard" when they change the file type so often?
Try to keep an open mind, and relax a little.