It's great to see more and more planning tools coming out of the OCS team. Well done folks!

The original post can be seen here: http://communicationsserverteam.com/archive/2008/08/29/248.aspx

Currently I see the largest issue being the lack of support for all supported topologies. Checkout the statement from the blog entry:

Topologies

Currently the tool only supports the Consolidated, Single-Site and Scaled Single-Site topologies.
The tool does not support the Remote Site Edge Topology (either scaled or un-scaled).
In order to get around this, users should use Single-Site or Scaled Single-Site to configure your primary Edge data center.

Otherwise the reporting for different teams, the interview style questions are all great.  This isn't meant to be a replacement for BPA and as such won't connect to your live OCS to gather config info. that would make it a real pain when trying to architect for several different customers or sites even.