I like how easy it was to use - everything was very intuitive! There were no features we didn't love (or dislike).
The ease in which users could navigate through our program made training staff members much more efficient. It would've been nice if there had been some way to customize certain fields or add additional ones so they matched what we needed exactly but this isn't something i'd say hindered us at all because it's not necessary. We realized many people weren't aware about using TRAC before coming into work and now everyone knows where things go when creating events/meetings etc.