Hampshire College purchased Entrinsik's Informer in 2010 to address the campus-wide need for operational (daily) reporting, ad-hoc requests as well as use in our datamarts for a quick view on analytic data. Informer helped Hampshire's IT department transition from "we'll write that for you" to "we'll show you how to write that report".
We previously evaluated two other products and informer was a hands down winner. The comparisons included purchase price, implementation timeline and training, end user adoption and support, and ease of use.
We are more than open to investigating other reporting tools. But when considering cost, functionality and usability I doubt we will find any other product in the market that comes close to offering us as a complete solution as informer.
Informer's foothold was established in the U2 (Universe/Unidata) world, but works with SQL as well. I have no knowledge of how/if informer may be used in the growing NoSQL movement (such as Mongo). Entrinsik's customer support is very good and responds to requests in a timely manner with great support.