Around DFW it seems like most cops are using Ka, and some K. Most of the falses I get are X band from atomatic doors at storefronts. I just took a road trip from Dallas to Colorado and back, and by far Ka was the main band used.
I actually got a ticket about one hour outside of DFW on my way up to CO. It was a TX State Trooper with instant on radar at night, and I was the only car on the road for a big stretch. Even if I'd had the ZR3 shifter I plan on getting, it would not have saved me. In that case, instant on radar is even more dangerous than laser for a speeder.
But still, I love my Passport SR7 and would highly recommend it.