I like the looks of the UI, but when I implemented some table filtering for my own purposes, I need more functionality. (My UI was terrible so no help there.)
For numeric data I needed relational filters, e.g., "> 35" and multiple filters, e.g., "> 35" and "< 90". That made the UI for adding and removing filters more complex, but perhaps single numeric filters could work if you had a suitable simple grammar for multiple conditions. For text fields, I also needed to be able to say "give me rows that do NOT contain regexp"
