I've discovered that my 9500i, when in Highway mode and when driving fairly slow (not at highway speeds), does filter out very weak constant K band signals which are either fairly constant in strength or which are only rising very slowly in signal strength. I guess the logic is that if its weak and constant K band and you aren't driving very fast, then it obviously poses no threat. Its as if the 9500i's Highway mode incorporates some of the filtering capabilities of the Autoscan mode found on the Bel models. Yet, even while driving fairly slowly in Highway mode, my 9500i instantly alerts to even the weakest K band signal whose signal strength is rising more rapidly. This happened when a patrol car with continuous-on K band was cresting a hill way off to my right. He had his lights on and was in the process of pulling over another motorist. I instantly got the very weak yet rising alert to his K band radar, and my 9500i also displayed the signal strength of the weak constant K band door opener radars which it had previously decided to ignore. I had my 9500i in Expert display mode when this happened. It was fun to watch the police K band radar's signal strength slowly rise from 1 all the way to 10 as he approached the intersection ahead of me. Its obvious that the 9500i's Highway mode features some pretty slick programming to filter out really weak relatively constant and non-threatening radar signals depending on your speed. I highly recommend using the Expert display mode when using the 9500i in town since Expert display mode shows you any and all radar signals being received.
In short, its obvious that there are many more software algorithms being employed within the 9500i than has been disclosed by Escort. One of Escort's CS reps told me that the firmware for the 9500i is extremely complex and that there is a lot more going on within the 9500i aside from its apparent basic features. Needless to say, the CS rep wouldn't elaborate further.
I just got back this evening from visiting my father who lives about 90 miles away. I decided to use my 9500i for this entire trip rather than my STi. At highway speeds my 9500i proved every bit as sensitive as my re-flashed STi which has been performing extremely well. I received two really long distance K band detections on rural highways, plus one long distance Ka band alert around a rather moderate yet distant curve while on I-75. At highway speeds (I'm guessing anything more than 50 mph) my 9500i doesn't seem to miss a thing -- not even the weakest signals.
I guess what I am trying to say is that you definitely have to take the time to get used to the 9500i since it behaves differently than any other radar detector. When I received my 9500i, I was ready to get rid of it the following day. But I stuck it out and decided to try it out for an extended period since the 9500i forces you to overcome your intuitions and experience about what makes a really good radar detector. I'm glad I did for the following reasons:
-- My 9500i is by far the quietest radar detector which I have used in town. That's really the reason why I bought it since I wanted a radar detector specifically to use for trips to and from town and when in Atlanta.
-- At highway speeds it doesn't miss even extremely weak and very distant radar guns. This surprised me somewhat.
-- Even in Highway mode, it is surprisingly quiet when used in town as long as you are not traveling at highway speeds.
-- In Auto Sensitivity mode it completely filters out pairs of all but really strong X or K band door opener signals when you are driving rather slowly. My 9500i in Auto Sensitivity mode, compared to my STi in Autoscan mode, rarely makes a peep while in town and passing moderately distant K band door openers at moderate driving speeds.
-- In Auto Sensitivity mode, its filter threshold for pairs of door opener signals seems to be speed dependent, with the filter override threshold being much higher at slower speeds. I've definitely determined that the filter clipping is overridden once your speed is greater than 15mph, and it seems that Auto Sensitivity's filter clipping is further reduced as your speed increases. This will require further testing to confirm this one way or the other. In any event, the 9500i in Auto Sensitivity mode is deathly quiet around town without having to use TrueLock. Its just incredibly pleasant to use the 9500i in Auto Sensitivity mode while in town.
Note that I have only locked out X band falses around town since K band is still used in my town by one city police department and by the county sheriff department. Thus I am very conservative when using TrueLock since I still have reservations about locking out K band falses until I have done a lot of further testing.
In summary, my 9500i has proven to be an exceptional radar detector for use around town. It has also surprised me with its extremely high sensitivity when traveling at highway speeds.