Was taking my daughter to school this morning, and had just turned left onto the road that runs past her school when I got a K-band alert. Had a very nice ramp up, and I thought for sure there'd be a LEO up there, enforcing in the school zone. Instead, there was a Your Speed trailer. I had the alert as SOON as I turned toward the signal, so about .33 miles. Two slight curves, a hill, and several buses in the way, too. So I was very happy with this detect.
I was worried about my k-band detection ranges lately because there is a construction sign at the crest of a HUGE hill. It has a K-band gun on it, and when I went up the hill, I literally didn't get an alert until the top of the sign was in view. Nowhere NEAR enough time to slow down. But the sign is just over the crest, and can't be seen from the bottom, so I had my buddy with his X50 test it. He had the same results -- only about 200 yards warning. So I drove south, then turned toward the sign at the crest of an earlier hill where I normally get no falses, and voila! K-band, 2-bars.
So my k-band detects are fine. And for those doubting Whistler's ability to do around-the-curve detects -- they work just fine. My Pro-78 isn't stock, but the improvements are mostly filter-related and have very little (if anything) to do with off-boresight sensitivity.