Completely happy with my V1, owned it nearly a year now, nothing even remotely resembling a close call in that time, blah blah blah.
I'm running 3.818 with the following settings - features b-G enabled (5-second delay, unmute at 4), as well as Ku detection on. Ku was more for kicks, as I've seen nothing set it off aside from GPRS handheld radios. Mounted top-center of my windshield, behind a non-metallic tint strip, with a concealed display in the gauge cluster.
A month or so ago, my brother finally hopped on the V1 bus with a new model of his own, version 3.825 I believe (factory settings all around). I haven't noticed any change in type/amount of alerts on my unit, I regularly get Ka warnings and the occasional K (usually muted and false). However, my brother made a comment about a speed limit sign down the street from where we both work. He would get a full alert when turning on to the street, while I got absolutely nothing. The closest I've come was a weak single rear alert on my way home from work.
Installation difference? Tint issue? Sure I thought, I'll just drive down the street and sit in front of the sign. Nothing happened. I approached the sign from all directions, snail's pace, windows down, and not a single alert. The sign was definitely on, flagrantly flashing my speed the whole time.
My initial thought is that it could be related to Ku detection, since that's the only major difference in our setups. I've turned it off now, and will find out if this helps once I go to work Friday. I'm really baffled though - I've picked up all sorts of X K and even Ka speed signs, this one must be using some wonky wavelength or something.
Any ideas out there?