I have the license plate kit and likes it very much (look at my installation tips on the home page...also take a look at the posted installation instruction to see if you can tackle such installation). If you have a black car like mine, the sensors are almost stealth (unlike the big black under-bumper mounted kit). The kit comes with it's own speaker, sensors, and control module, which taps into the reverse light for power and activation. Installation was pretty straight forward, but I must warn you before hand that it's a pain in the A$$ to fish the 2 sensor wires from the tailgate into the trunk floor (due to the rubber boot connecting the two) - this is the most difficult part of the installation.

The kit is working perfectly so far. It's not getting as great of a coverage on the sides since there are only 2 sensors in the middle, but you'll still get solid beep when you're 1 ft away from the wall backing in at 45 degrees (it'll start beeping at about 2-3 ft away).