I have an 8500 and a Jammer. My prevoius detector was a Bell and I could "piggy back" the jammer using just one power cord.
Escort's power set up does not allow this.
I have tested the jammer on the occaisional roadside fixed radar which displays the drivers speed. I have seen this display actually go blank when I approach!
Given only one option, I'd spring for a good detector. I highly recommend the 8500.