Ups and downs with Excel Services

Recently I've been dabbling with using Excel Services and Power Pivot for some dashboard reports in SharePoint 2010. Cool technology, and when you start reading the Excel team blog you can't help but have respect for the detailed, valuable information posted there.
Just after reading, I quote "The thing worth calling out in this blog article is that the error messages in this space have gotten much better." this happened:



and I was just telling the Mossig user group this week how I felt software was starting to work, after all those years.....