I have a 9500ix, and it detects multiple signals and informs you of such. It will actually speak out "Multiple signals detected", and if you have the advanced display mode (I can't recall what it's called), it will show the various bands (X, K, Ka) and display a signal bar below it. If there are multiple signals of the same band, for instance Ka, it will display the two bars with their relative signal strengths. This would be similar to the Bogey alert of the V1, but it's nice because it will actually tell you which band it is. With the V1, if you get a "3" in your bogey counter, and the X and the K light up, you don't know which of the three they are, nor their relative signals. In any case, one will definitely slow down when you get a 3 signal, but it's nice to know if it's a X, K, or Ka. In the Bay Area, there are tons of grocery store door openers that set off the X and K bands, so when I see them, I am a little less concerned than when I see a Ka alert, which I am positive is LE. I can see the bar diminish as I go further away from the one signal and see the other one get stronger as I approach it, all at the same time.
Fighting false alarms is also a great selling point about the 9500ix, as it uses GPS to lock out reoccurring signals in the same locations. Once it gets the same signal more than twice, it will lock out the audible alert the next time you pass that area, although there is still a visual signal on the detector that indicates a signal exists. If you drive by the same area more than twice, and it doesn't detect the signal, it will unlock it again. Very, very convenient. My 9500ix barely goes off nowadays, and when it does, you're damn sure that I will be letting off the gas or braking.
I hope this helps you willabeast, since you specifically live in the surrounding Bay Area.
