I recently sent one of my Valentine's in for a flash update from v3.825 to their current version v3.826 and its appears to have improved the "J" filtering capability as promised by VR.
On one test drive cycle I travelled from I-78 east to I-287 south and ultimately to the NJTP and I-295 in New Jersey during evening rush hour.
What I noticed, was that the latest V1 was indeed quiet and when it did alert to Ka several times, it almost immediately followed with the "J" alert tone and then edited out further Ka reporting entirely.
It did this as I was in the midst of a fair amount of traffic.
At this time, I am inclined to believe that the latest Valentine's provide some of the most advanced filtering [of "falses"] currently available and I would suggest that owners of previous software versions to get their detectors flash upgraded.
The V1 is the only model that has this advanced capability and further ensures that this detector remains on my short list of must-have auto electronic accessories.