I have one of these on my 27% Edge. I had some problems with it due to corrosion but it was replaced promptly and without any hassles at all.
Please keep in mind that while the Radio Shack jack and plug will do the job, it is not even close to the same thing as the Fromeco units. If this switch fails.......crash. The Fromeco unit uses a solid state Regualtor or Switch depending on which version you use. If the mechanical portion of the reliaswitch were to fail, current would continue to flow. It fails to "on". Fromeco's website has tons of technical information as well as the break down of their cost to produce (!). Take a look and decide for yourself...I did.

-Aaron

Fromeco