It´s not aware of any traffic intentions, so I´m not sure about runway traffic management. Maybe that one works, but overall you don´t get any AI traffic info other than the proximity advisories. Maybe that also applies for the ground traffic case but I never got any ground nor air traffic info so far, only a few proximity warnings while airborne.
Anyway I started using both BATC and Sayintentions recently and just got the 1 month option to test the later. Currently I only use it for VFR till that´s implemented in BATC. If other users who have used it for a longer period can reply that would be better.
Cheers