BV, Big Mil TCAS. I never had an RA in civilian ATC environment, quite a few TA, usually conflicting and climbing/descending traffic breaking the ROC/ROD closure thresholds. Military environment, had a couple of RA from other traffic not accurately flying their assigned altitude. Also, many thousand TA during AAR, which was expected (TA only selected) and easily worked into the routine. However, several occasions saw (on TCAS) joining/departing traffic at incorrect levels and kit allowed safe resolution of the situation.
Cheers
OAP