I would say the state of the state is still the V1.
I haven't kept up since I purchased my Escort, but at the time I purchased, the V1 was acknowledged as the most sensitive HIGHWAY radar detector, slightly ahead of the 9500ci.
However, a MAJOR problem with the V1 is falsing: In the city, the V1 will drive you nuts with all of the false alarms. The 9500ci remembers where it detected a signal (it uses the GPS and stores all alarms), and won't signal you if the same signal in the same location is detected four times in a row. So, over time, you're only alerted to new signals. The V1 just keeps on beeping every time is detects a signal.
Also, the V1 doesn't have the speed-camera database, so you won't know ahead of time whether that signal you're alerted to is just a stray or is a camera.
And the V1 isn't detector-detector-proof. I commute into Virginia and DC, where radar detectors are illegal. The cops will detect your V1 (and confiscate it), but can't detect the 9500ci.
Finally, the 9500ci has a built in laser-jammer. The widely accepted wisdom is: if your detector alerts you to a laser, it's too late. The 9500ci jams incoming laser, so you won't get a ticket. The V1 doesn't jam.
I agree that lots of people swear by the V1. It's a great detector for the open road, but there's a reason people pay five times as much for the 9500ci, installed.