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.

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Scott
2002 G500
2003 Audi Allroad
1999 Range Rover
1992 500SL (sold)
1999 ML320 (sold)
1989 300SE (sold)
1987 560SL (sold)
1986 300E (sold)
1983 300SD (sold)
1982 300D Turbo (sold)
1980 300D (sold)
1973 450SL (sold)