ASD has been around for many years and has enormous potential but after testing it I won't be spending any money on it.
I've been testing it for about an hour and find it amazingly powerful but frustrating to use and lacks some simple features.
It needs:
A pallete to display options when selecting entities.
Double click editing of objects.
Matching similar bars in schedules.
Revision issues to bar modifications
We currently use CADSRC which hasn't been keeping with the times but at least has the above functions.
Definitely it has drawback but at the same time i think that can be overcome in coming time period.
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You would get all the answers to your queries