I talked to my local intaller that one of my friends recommended. The installer said the ZR4 is superior to the Laser interceptor. He says they go a few of the LI units, and were not happy with them. Their own testing showed the ZR4 is superior, but he will install what ever I want. Any independant tests in the last year comparing these units? I saw a test from 2008, but don't know if the equipment has changed since then.