Installed the M27's today with the Cheetah Wireless kit on my Buick Regal. It was fairly easy. Mounting the heads was the hardest part. Made sure they were parallel and level. Seeing more and more laser guns in the Austin area both motorcycle and cars. Had bought the ZR4's first but sent them back and ordered the blinders and wireless kit from Radarbusters. Using the 9500ix for radar protection. I keep it 10- 12 over PSL when traffic allows so have to see how long it takes to get a laser hit.