WRONG. Do not even dare say that. How can they say 12 bands if there is only 4 bands of radar? Cobra is THE worst radar detector ever made.The Cobra is great. It picks up everything, but it doesn't have the arrows. I have the XRS9930. It's a 12 band model and it's saved me quite a few times. You can find them online for pretty cheap compared to the V1. Costco was actually selling them for a while.
I don't know what problems you've had with them but mine works great.
The Cobra picks up Ku, K, Ka, Specter, POP, Laser, X, VG, VG2, emergency vehicle and train warning signals (which usually triggers the detector before you can even hear a siren) and so on. It picks up 6 forms of radar, 4 forms of laser, and 2 forms of emergency signals.
I just know from my experience the Cobra has worked well. I used to have a Beltronics; it had a shorter range and cost twice as much. I drive a highway full of blind corners that CHP like to hide around and it usually gets the jump on them. I'm happy with it.
The nice thing about the one I have is that before I hardwired it, I had it plugged into the cigarette lighter which is constantly powered. The detector monitors battery voltage and can sense when the car is off. After 10 minutes it will shut itself off, or if the battery voltage drops below 11.9 V. It has a battery voltage meter and digital compass built in. Got mine for $79 from Costco.