It ran without major problems in our environment (Electrical 2D-planning, lots of block-inserting and
many attributes with data).
We started to use Bricscad with V9, for first tests we used V7+8. Transition ran smooth but slow
(50 Users) because we also introduced heavy customization (LISP + OpenDCL) during this time.
Bricscad-support was great from the beginning, we had troubles using OpenDCL which they fixed from V8
to V9 if i recall correctly. A near show-stopper was the absence of a bmp-printer,
our IT-Departement fixed that for us. The lack of the possibility to create dynamic blocks is no problem for us.
Right now we have 70+ Users, customization now also uses C# and we evaluate the BIM-Module which looks,
though very basic at the time, promising.