My only radar detector experience has been with my V1 which I have owned now since around 2000 when I bought it when I moved to the KC MO area and remembered how aggressive speed limit enforcement is there.
The unit has suffered a couple of problems: false alarming on laser when laser not present, and false alarming on some other band when nothing present on that band; and both times I called and arranged to send the unit in and as per instructions included a check made out to Valentine One and for IIRC $45 and both times the unit was returned to me with the check still in the box. I called and asked if there has been a mistake and the check overlooked and both times I was told the repair was no charge.
The unit gives me plenty of warning and the directional arrows and bogey counter are very nice. I have not fiddled with its settings to try to reduce the alarms on say door openers because I like to use the alarms as a reminder to stay vigilant and situationally aware. This not only reduces the chances of getting pulled over -- the radar detector doesn't make the car invisible to radar -- but the chances of getting involved in an accident.
Anyhow, put me down as highly recommending the V1.