Hi,
The attached image is just the basic concept.
Ideally, I would end up with your filter row organized vertically, in an accordion which is divided by column group. The user would be able to alter the filter type for given columns and so on.
An alternative would be to have a drop-down where they could select a field, then add criteria for that field. They could then add another field and so on. It would still be nice to be able to select the type of criteria to use for each field (gte, lte, etc).
You have done such an excellent job creating the filtering capabilities that it is almost impossible to duplicate what you have right now.
My clients deal with large grids with hundreds of columns, and it is difficult to scroll across and find the proper columns.
I appreciate your assistance with this.