The V1 is noisy, but for me it's worth it. No one else has the arrows, which is a deal breaker for me. The classic situation is when you pass a cop car with the radar detector blaring, but the V1 says there is still a strong signal in front of you. With any other detector you would have no idea.
I've had my V1 for over 10 years, and I've never once been caught by radar in all that time (did get caught by pacing once though).
The V1 isn't perfect, but for me the sensitivity and arrows are a trump card over any other detector.