We had a customer looking for a consolidated report of the test sets and their test cases, grouped by release and test set folder. The report needed to have the individual test case instances in the test set along with the associated test runs.
We had a customer that was looking for a more automated way to remove test cases from a test set. The good news is that our REST API makes this easy.
One of the limitations in SpiraTest and SpiraTeam v4.x was that for performance reasons we could not handle test sets with very large numbers of test cases and that the system was not able to display the counts of the test cases and the execution status for test set folders.