Hi there.
We are a small architectural firm and recently upgraded to ACA after a huge research of all other BIM software. Why?
There are some points:
- cost
- ACA is Autocad based so all of us were "good to go" after just 2 days training by ourselves
- The logic behind ACA is identical as plain Autocad with xrefs, blocks, viewports, sheets...
- Any time you want, you can switch back to basic Autocad
- All our contractors work with Autocad
- Huge amount of dynamic blocks we developed over the years
- We use Autocad also for concepts, schemes, basic 2D, we create whole presentation boards for competitions, what usualy is done in Illustrator. Also, now I'm evaluating Sketchbook software and I think we'll go with it. It integrates in ACA and it's a killer combination for presentations!
So we just decided it's no worth adopting a completely new software for something that Autocad with an ACA "upgrade" does just fine.