A couple of things, powerful data navigation and export to pdf from the UI are rely nice features and they will make life easier for the end user, but in my experience the main user of a DB admin application are developers, DBA's and admins. Most of which are not as concerned with the actual contents of the data, as they are with the structures of the data as well as the performance of the data.
Developers general concern themselves with the data when they are setting up test, or diagnosing a data related problem but in the coarse of a day most of their focus is on the structure and performance of the data and database.
The point being, generally your call center rep or your accountant (the end user) uses a custom interface dedicated to data navigation and data viewing (coupled with workflow) these features will most likely not be exposed to them and they are the users most advantaged by them, particularly the export to PDF feature.
Again, please don't take this as knocking your hard work, I think that powerful data navigation is important for those times that you do have to directly manage the data and think other DB admin front ends are severely lacking in that departments, but I urge you to keep in mind that in most organizations almost all the end users that are interested in the actual data are buffered away from a raw DB interface, even report writers who know SQL fairly well are buffered with tools such as Cognos and Crystal Reports.
But I think you have the basis to cure a pain point that plagues a lot of organizations given that you now have a good base product to build a robust development tool on.
A portion of (software) developers do not like and look at relational databases as second class to actually writing software. If you can mold your tool in to providing deep analysis and diagnostics and marry that with solution engine that provides recommendations on how to optimize and refine the data structure and query structures so that they are more performant, more secure, less resource intensive and you can do this in a seamless way you are scratching an itch that a good portion of developers cant reach.