The way the early versions were (rather hurriedly, I thought) introduced, combined with the limitations inherent in those versions tended to result in multiple avoiding actions which made some controllers' jobs a bit of a nightmare, at times.
We were shown a video of some of the situations that had occurred, complete with the controllers explanations on what the results were, as part of the training for its introduction. This didn't give us much optimism.
The later versions - which didn't take too long to be introduced - are obv far superior.
As mentioned above, they are not a good tool for pilots to attempt their own traffic management prior to an alert occurring. The azimuth display can be far from accurate.