Pros:
1) Provides statistics at attribute/table level
2) Querying & removing incorrect rows from table
3) Very responsive UI
4) Detailed results summary (while debugging on the fly) displaying the rules that failed alongwith the calculated values of each feature

Cons:
1) Unable to delete matcher/feature/rule/project/table
2) Editing a rule gives errors when AND relational operator is used between the features
3) Editing a matcher is very difficult through the textbox
4) Taking a sample of a table X changes X itself