havent noticed much delay in the system that my ac has. a bit of common sense when using this system is not, i think, a bad thing. when there is ONE ac in the vicinity, it has been cleared to the level below me, and i can SEE that it will not hit me, i wont follow the RA as it is just getting upset about a high closure rate. this also goes for vfr situations where ac can get close to each other, though not dangerously so. my feeling is that in some situations the RA command can put you into a worse situation. need to bear in mind of course that you do know where all ac are around you due to their iff. people talk about the ac that you dont see, well you will see it on your screen, the only time you wouldnt being if the other ac's transponder isnt transmitting, meaning of course that there could be know TA/RA off it anyway as you need two valid systems. just think that common sense can be applied quite safely in many situations.