Hello Diver - our (URSA's) experience with IRIS has been very good. The need for delay seems to be associated with testing with a hammer (up close and personal to confirm the gear is good to go for an event). Lynn shot the NorCal event last weekend and shot it fast - no problem getting the lights to flash. For now we are sticking with IRIS - and hoping that RTAC will stand behind their assurance that they will repair if needed. They (RTAC) are also working on a project that was already in work when the sale was made - a longer range remote. That is where we experienced "problems" - shooters think they "must" have had a hit but no light. Lynn and I have both shown that NOT to be true within minutes after the complaint was raised - hits and lights. So, possibly we'll "soon" have a remote that works with our current gear and we can promptly demo that the lights are working just fine.
Not sure about your idea of good, I stopped attending the NorCal matches the winter before last because none of the URSA's 6 IRIS systems could be made to work several events in a row. We found impacts on the target when there had been no lights. We made 3 trips to the target one event when the system would react to the first hit, but ignore the subsequent ones. The system can react to some hits, but not others.
Also, the remote only tests that the flash unit is charged and switched on. An impact detection module doesn't have to be functioning, or even on, for the remote to trigger the flash. The impact detection modules and their mounting are where the problems are.
The system is fast enough for ELR, but not much else. Again, the delay is built into the impact detection module, probably to give time for the target to stop ringing. You can press the remote as often and as quickly as you like and it will flash. I can't trigger it that often with the impact detection modules.