Experience with UML modeling using Topcase

I apologize in advance for bringing up an off-topic subject but members
of this forum are uniquely qualified to answer the questions. If you
respond, please do so directly to me so that forum bandwidth is not abused.

I am soliciting hands-on experience with using the Topcase UML drawing
tool. In particular I am interested in the following issues...

How useful is Topcase for simple UML modeling? I am particularly
interested in the sort of modeling one might encounter in university
course work.

Is Topcase suitable for simple modeling situations where there is
minimal tool training? An example might be someone new to UML modeling
who wants to experiment with it to see what its like.

How useful is Topcase for systems engineering issues? I am interested in
application partitioning at the subsystem level, defining communication
protocols between subsystems, and support for SysML.

--
There is nothing wrong with me that could
not be cured by a capful of Drano.

H. S. Lahman
hsl@pathfindermda.com
Pathfinder Solutions
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