VisEcad as a view and review tool has the advantage of not requiring Native tool data. The encrypted format of the data allows for offsite review without providing IP specific data. This alone has made this a very popular review tool for engineers.
I also find it interesting that you find that VisEcad is "too expensive", since the license can be obtained for free at:
visECAD Viewer Software - Mentor Graphics
Thanks
Vern