I've been working with a new User Interface Platform group in Microsoft Services IT for the last three months.  This group is using Panorama as their BI interface within their platform. 

Although I have a bias toward building custom web based applications for BI UI's, I must say that I'm impressed with Panorama.  The charting is great and the security models are flexible.  I would say the biggest drawback I've seen at this point is that Panorama does not handle dynamic security models in Analysis Services very well.

One thing I really like about Panorama is that you can customize slicer security by altering their base asp files which gives you maximum flexibility when dealing with data level security.

I'll try to post more information about Panorama in the future.