I have just returned home from a gueling semester at MIT, and went out for a quick drive on one of my backroad shortcuts..... I got an unfamiliar K-band alert, and with no signs of life or other cars in the area, it got my adrenaline flowing....
The alert persisted for about a minute on and off.... the road was hilly, and every time I peaked, I got a blip of K-band, increasing with each blip. This is not like the typical 1793 K-band falses (K-band 1 or 2 bar, two beeps), which comfirmed my suspicion.
On the final hill, about halfway up I got a K-band 4/9 alert that ramped up nicely and gave me about a 10-second heads-up to a Your Speed Is sign right on the hill.
Overall it was about a mile alert (~ 1 minute heads-up). I was satisfied for 3 reasons:
(1) An intermittent K-band alert from this detector can be differentiated from the K-band falses.
(2) Demonstrates adequate sensitivity with its 1-mile pickup.
(3) On the final hill, gave good warning against an over-the-hill threat.
Not bad, not bad.... Makes my decision about whether to upgrade to the XTR-690 even harder...