i have used data cadd and found that it is a very weak program when seen side by side with vectorworks. the biggest problem i have with data cadd is that while it is a decent 2d or 3d program it cant do both at the same time with the flexabilty that vectorworks can. you can get a free 45 day trial on data cadd by downloading it from there web site. i think that you will find vectorworks a very superior program.