After a lot of research into this type of "instant on" speed radar device, I came up with a double sided sword. Since the signals on this band are very weak, gaining increased warning time is a must...or is it? By the way, this mode is also used on photo radar (POP).
As to its operation, the accuracy of this IO radar is very poor (up to 10-15 mph + or - errors). In fact, it's so poor that one manufacturer warns of NOT using the readings alone in a citation issued case. But I'm sure many LEOs out there go ahead and do the opposite. My feelings are that some LEOs do use it as a "general" indicator of an approaching speeding suspect, believing that if this vehicle is RD equiped, his IO radar will not be detected. If the reading shows this to be true, and along with his visual estimates, he would then switch to another more accurate device for citation use. Of course some LEOs ignore the manufacture's warning and going to court with this evidence alone will allow the case to be thrown out.
So in this case, the use of IO can benefit both LEO and target vehicle. For the target, it will give an extra few seconds to slow down while the LEO switches to a more accurate mode, thinking the IO can't be detected by detectors because its pulse is so quick.
But there is a problem for the driver using the IO mode in his RD (if its an on/off option that's selectable). Leaving it on will increase the RD's sensitivity on this band (Ka) including false signal detection. So if you are not bothered by numerous false signals, leave this option on. The increase in RD sensitivity increases warning time with this mode on and that's a plus for the RD user.
Any comments, pro or con, welcome!