I use pivot tables all the time. The concept is brilliant, but the Excel UI leaves a lot to be desired.

At first, you're amazed at the flexibility, but once you become comfortable, you suddenly hit the limitations. Can't sort by a calculated column, can't categorize without adding columns in the data, etc.

I looked at Quantrix for a while, and it was a bit too complex for practical purposes. I wonder if there are any decent PivotTable tools out there?